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.

1, 1, 1, 1, 1, 1, 1, 9, 15, 29, 57, 137, 413, 1389, 4485, 15371, 54209, 224739, 1032991, 5497929, 29140255, 171761393, 1058704295, 7315438183

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