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A147348 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 01010-11111-00100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 5, 1, 13, 1, 69, 13, 485, 49, 4382, 229, 57887, 1867, 1002742, 20463, 24091943, 291821, 827339114, 6315721, 38784934830, 181852653 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.1.0.1.0.0.0

.0.0.1.1.1.1.1.0.0

.0.1.0.0.1.0.0.1.0

.1.1.0.0.0.0.0.1.1

.0.1.1.0.0.0.1.1.0

.1.1.0.0.0.0.0.1.1

.0.1.0.0.1.0.0.1.0

.0.0.1.1.1.1.1.0.0

.0.0.0.1.0.1.0.0.0

CROSSREFS

Sequence in context: A322664 A286457 A327766 * A081224 A104793 A243883

Adjacent sequences:  A147345 A147346 A147347 * A147349 A147350 A147351

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified May 17 00:16 EDT 2021. Contains 343957 sequences. (Running on oeis4.)