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A147052 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-1101-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 17, 21, 509, 957, 9009, 23635, 500815, 1453635, 110991021, 410901579, 51936051799, 236370303513, 42297696189623, 235560923543349, 80009496099425831, 544930757644765859 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

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

.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.1.0

.1.1.1.0.0.1.1.1

.1.0.0.0.0.0.0.1

.1.1.0.0.0.0.1.1

CROSSREFS

Sequence in context: A050845 A219396 A125613 * A147132 A146840 A146587

Adjacent sequences: A147049 A147050 A147051 * A147053 A147054 A147055

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 30 22:45 EST 2023. Contains 359947 sequences. (Running on oeis4.)