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A147447 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11000-01100-00110-00011 pattern in any orientation. 0
1, 1, 1, 1, 1, 3, 7, 13, 39, 123, 461, 2371, 13249, 80863, 611487, 5648891, 61162833, 795442861, 12190308735, 215424452659 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.1.0.0.0

.0.0.0.0.1.1.0.0

.0.0.1.1.0.1.1.0

.0.0.0.1.1.0.1.1

.0.0.0.0.1.1.0.1

.0.0.0.0.0.1.1.0

CROSSREFS

Sequence in context: A145956 A155225 A051842 * A062605 A191974 A174241

Adjacent sequences:  A147444 A147445 A147446 * A147448 A147449 A147450

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified July 24 10:53 EDT 2021. Contains 346273 sequences. (Running on oeis4.)