A147500 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1110-0110-0111 pattern in any orientation.

1, 1, 1, 1, 1, 3, 9, 19, 37, 159, 849, 4243, 19707, 136969, 1272775, 12839957

Offset

1,6

Links

Table of n, a(n) for n=1..16.

Example

Maximal 8 X 8 example
.0.0.1.1.1.0.0.0
.0.0.0.1.1.0.0.0
.1.0.0.1.1.1.0.0
.1.1.1.0.0.0.0.0
.1.1.1.0.0.0.0.0
.0.0.1.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A339495 A146694 A146050 * A300445 A115238 A005994

Adjacent sequences: A147497 A147498 A147499 * A147501 A147502 A147503

Keyword

nonn

Author

R. H. Hardin

Status

approved