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A147508 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11110-01111 pattern in any orientation. 0
1, 1, 1, 1, 1, 3, 9, 23, 81, 267, 1053, 6173, 40853, 301993, 2684783, 27089119, 322029889, 4723820567, 81998776493, 1660922956591, 39864394187483, 1124746291185333 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.1.1.1.1.0.0.0

.1.0.1.1.1.1.0.0

.1.1.0.0.0.0.1.0

.1.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.1

.0.1.0.0.0.0.1.1

.0.0.1.1.1.1.0.1

.0.0.0.1.1.1.1.0

CROSSREFS

Sequence in context: A018334 A146392 A116659 * A146472 A145955 A129834

Adjacent sequences:  A147505 A147506 A147507 * A147509 A147510 A147511

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified January 26 09:45 EST 2022. Contains 350598 sequences. (Running on oeis4.)