OFFSET
1,7
COMMENTS
"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.
LINKS
J. Haarmann, M. Murphy, C. Peters, and P. C. Staecker, Homotopy equivalence of finite digital images, arXiv:1408.2584 [math.GN], 2014.
P. C. Staecker, Some enumerations of binary digital images, arXiv:1502.06236 [math.CO], 2015.
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
P. Christopher Staecker, Oct 13 2014
EXTENSIONS
a(8)-a(9) from P. Christopher Staecker, Feb 24 2015
STATUS
approved