  The UV fixed point theory of SU(2) gauge theory with N_f = 0,1,...,7 flavors
is believed to have the enlarged E_{N_f +1} flavor symmetry. Actually it is not
easy to check this conjecture because the UV theory is strongly-coupled,
however, computation of certain SUSY protected quantities provides strong
evidence for the enhancement of flavor symmetry. We study the superconformal
index for SU(2) gauge theory with N_f = 0, 1 flavors in details, and we give a
support for the enhancement by studying combinatorial structure of the
superconformal indexes of these theories. We also give a nontrivial evidence
that the local F_2 geometry leads to the E_1 superconformal field theory.
