  We compute the A-infinity structure on the self-Ext algebra of the vector
bundle $G$ over an elliptic curve of the form $G=\bigoplus_{i=1}^r P_i\oplus
\bigoplus_{j=1}^s L_j$, where $(P_i)$ and $(L_j)$ are line bundles of degrees 0
and 1, respectively. The answer is given in terms of Eisenstein-Kronecker
numbers $(e^*_{a,b}(z,w))$. The A-infinity constraints lead to quadratic
polynomial identities between these numbers, allowing to express them in terms
of few ones. Another byproduct of the calculation is the new representation for
$e^*_{a,b}(z,w)$ by rapidly converging series.
