A255538 Number of connected rigid digital images of n points, up to isomorphism.

1, 0, 0, 0, 0, 0, 2, 26, 544

Offset

1,7

Comments

Rigid means that the identity map is not homotopic to any other map.

Links

Table of n, a(n) for n=1..9.

P. C. Staecker, Some enumerations of binary digital images, arXiv:1502.06236 [math.CO], 2015 (see table p. 3).

Crossrefs

Cf. A248571, A255537.

Sequence in context: A364196 A216254 A177316 * A302719 A090247 A371296

Adjacent sequences: A255535 A255536 A255537 * A255539 A255540 A255541

Keyword

nonn,hard,more

Author

P. Christopher Staecker, Feb 24 2015

Status

approved