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A147380 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 23, 55, 135, 325, 777, 2227, 6637, 24107, 84917, 344887, 1418553, 6697895 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 11 X 11 example

.0.0.0.0.0.0.0.0.1.0.0

.0.0.0.0.0.0.1.1.1.0.0

.0.0.0.0.1.1.1.0.0.1.1

.0.0.0.0.1.0.0.0.0.1.0

.0.0.1.1.0.0.0.0.1.1.0

.0.0.1.0.0.0.0.0.1.0.0

.0.1.1.0.0.0.0.1.1.0.0

.0.1.0.0.0.0.1.0.0.0.0

.1.1.0.0.1.1.1.0.0.0.0

.0.0.1.1.1.0.0.0.0.0.0

.0.0.1.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A297852 A297953 A084898 * A146606 A101302 A102948

Adjacent sequences:  A147377 A147378 A147379 * A147381 A147382 A147383

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified May 25 17:53 EDT 2020. Contains 334595 sequences. (Running on oeis4.)