A255537 Number of connected pointed-irreducible digital images of n points up to homotopy equivalence.

1, 0, 0, 0, 1, 2, 9, 68, 1110

Offset: 1

Author

P. Christopher Staecker, Feb 24 2015

Keywords

• nonn
• more
• hard

Comments

"Pointed-irreducible" means that the identity map is not homotopic to any nonsurjective map having a fixed point.

Links

• P. C. Staecker, Some enumerations of binary digital images, arXiv 1502.06236 [math.CO], 2015.

Crossrefs

Cf. A248571.