%I
%S 1,0,0,0,1,1,3,28,547
%N Number of connected irreducible digital images of n points up to homotopy equivalence.
%C "Irreducible" means not homotopy equivalent to any digital image of fewer points. The terms are nonzero for all n>4, and are believed to be strictly increasing for n>6.
%H J. Haarmann, M. Murphy, C. Peters, and P. C. Staecker, <a href="http://arxiv.org/abs/1408.2584">Homotopy equivalence of finite digital images</a>, arXiv:1408.2584 [math.GN], 2014.
%H P. C. Staecker, <a href="http://arxiv.org/abs/1502.06236">Some enumerations of binary digital images</a>, arXiv:1502.06236 [math.CO], 2015.
%K nonn,more,hard
%O 1,7
%A _P. Christopher Staecker_, Oct 13 2014
%E a(8)a(9) from _P. Christopher Staecker_, Feb 24 2015
