A147434 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111-0101 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 5, 17, 31, 51, 113, 291, 823, 2647, 8411, 31311, 121645, 537901, 2460285, 12092291, 63560047, 371846157, 2296989649

Offset

1,8

Links

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

Example

Maximal 8 X 8 example
.1.0.1.0.0.0.1.1
.1.1.1.1.0.1.1.0
.0.1.0.1.0.0.1.1
.0.0.0.0.0.1.1.0
.0.1.1.0.0.0.0.0
.1.1.0.0.1.0.1.0
.0.1.1.0.1.1.1.1
.1.1.0.0.0.1.0.1

Crossrefs

Sequence in context: A143798 A031013 A031370 * A147336 A128354 A078654

Adjacent sequences: A147431 A147432 A147433 * A147435 A147436 A147437

Keyword

nonn

Author

R. H. Hardin

Status

approved