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A147506 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 11110-01111 pattern in any orientation. 0
1, 1, 1, 1, 3, 5, 13, 17, 45, 89, 2453, 5391, 90561, 234023, 4542721, 13430469, 852217819, 3057070197, 235450310313, 994613290405, 113069663601167, 560671202395083, 138912840204968035 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.1.0.0.1.0.0

.0.1.1.0.0.1.1.0

.0.1.1.0.0.1.1.0

.0.1.1.0.0.1.1.0

.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A307512 A080076 A128339 * A282960 A275969 A283063

Adjacent sequences:  A147503 A147504 A147505 * A147507 A147508 A147509

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified November 14 12:21 EST 2019. Contains 329114 sequences. (Running on oeis4.)