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A147511 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11110-01111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 9, 15, 29, 57, 137, 413, 1389, 4485, 15371, 54209, 224739, 1032991, 5497929, 29140255, 171761393, 1058704295, 7315438183 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 8 X 8 example

.1.0.0.0.1.1.1.1

.1.1.0.1.1.1.1.0

.1.1.0.0.0.0.0.0

.1.1.0.0.0.0.1.0

.0.1.0.0.0.0.1.1

.0.0.0.0.0.0.1.1

.0.1.1.1.1.0.1.1

.1.1.1.1.0.0.0.1

CROSSREFS

Sequence in context: A046356 A248381 A060874 * A124580 A103508 A051246

Adjacent sequences:  A147508 A147509 A147510 * A147512 A147513 A147514

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified May 22 09:12 EDT 2022. Contains 353941 sequences. (Running on oeis4.)