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A255538 Number of connected rigid digital images of n points, up to isomorphism. 0
1, 0, 0, 0, 0, 0, 2, 26, 544 (list; graph; refs; listen; history; text; internal format)
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: A228411 A216254 A177316 * A302719 A090247 A206601

Adjacent sequences:  A255535 A255536 A255537 * A255539 A255540 A255541

KEYWORD

nonn,hard,more

AUTHOR

P. Christopher Staecker, Feb 24 2015

STATUS

approved

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Last modified May 19 17:48 EDT 2019. Contains 323395 sequences. (Running on oeis4.)