  Coupled cell systems associated with a coupled cell network are determined by
(smooth) vector fields that are consistent with the network structure. Here, we
follow the formalisms of Stewart, Golubitsky and Pivato (Symmetry groupoids and
patterns of synchrony in coupled cell networks, SIAM J. Appl. Dyn. Syst. 2 (4)
(2003) 609--646), Golubistky, Stewart and Torok (Patterns of synchrony in
coupled cell networks with multiple arrows, SIAM J. Appl. Dynam. Sys. 4 (1)
(2005) 78--100) and Field (Combinatorial dynamics, Dynamical Systems 19 (2004)
(3) 217--243). It is known that two non-isomorphic n-cell coupled networks can
determine the same sets of vector fields -- these networks are said to be
ODE-equivalent. The set of all n-cell coupled networks is so partitioned into
classes of ODE-equivalent networks. With no further restrictions, the number of
ODE-classes is not finite and each class has an infinite number of networks.
Inside each ODE-class we can find a finite subclass of networks that minimize
the number of edges in the class, called minimal networks.
  In this paper, we consider coupled cell networks with asymmetric inputs. That
is, if k is the number of distinct edges types, these networks have the
property that every cell receives k inputs, one of each type. Fixing the number
n of cells, we prove that: the number of ODE-classes is finite; restricting to
a maximum of n(n-1) inputs, we can cover all the ODE-classes; all minimal
n-cell networks with n(n-1) asymmetric inputs are ODE-equivalent. We also give
a simple criterion to test if a network is minimal and we conjecture lower
estimates for the number of distinct ODE-classes of n-cell networks with any
number k of asymmetric inputs. Moreover, we present a full list of
representatives of the ODE-classes of networks with three cells and two
asymmetric inputs.
