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A147486 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 11011-01110-00100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 2, 1, 3, 1, 5, 1, 12, 3, 33, 8, 104, 23, 411, 63, 1754, 191, 8637, 685, 51410, 3493 (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

.0.0.0.0.0.0.0.0.0

.0.0.1.1.0.1.1.0.0

.0.1.0.1.1.1.0.1.0

.0.1.1.0.1.0.1.1.0

.0.0.1.1.0.1.1.0.0

.0.1.1.0.1.0.1.1.0

.0.1.0.1.1.1.0.1.0

.0.0.1.1.0.1.1.0.0

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A129982 A052552 A147000 * A168018 A173238 A173284

Adjacent sequences:  A147483 A147484 A147485 * A147487 A147488 A147489

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 22 16:15 EDT 2021. Contains 348174 sequences. (Running on oeis4.)