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A147509 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11110-01111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 5, 9, 15, 23, 53, 159, 467, 1455, 4183, 13257, 47381, 210539, 963601, 4871497, 24721415, 137844971, 829467103, 5811222331 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.1.0

.0.0.1.1.1.1.0.1

.0.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.0

.1.0.1.1.1.1.0.0

.0.1.1.1.1.0.0.0

CROSSREFS

Sequence in context: A033498 A147493 A178961 * A057259 A045599 A045604

Adjacent sequences:  A147506 A147507 A147508 * A147510 A147511 A147512

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified April 18 14:31 EDT 2019. Contains 322209 sequences. (Running on oeis4.)