A147356 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0110-0110-1111 pattern in any orientation.

1, 1, 1, 1, 1, 3, 9, 20, 53, 182, 863, 4532, 25697, 176361, 1505241, 14929100

Offset

1,6

Links

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

Example

Maximal 8 X 8 example
.0.0.1.1.1.1.0.0
.0.0.0.1.1.0.0.0
.1.0.0.1.1.0.0.1
.1.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.1
.1.0.0.1.1.0.0.1
.0.0.0.1.1.0.0.0
.0.0.1.1.1.1.0.0

Crossrefs

Sequence in context: A191527 A226106 A026566 * A147416 A078841 A147387

Adjacent sequences: A147353 A147354 A147355 * A147357 A147358 A147359

Keyword

nonn

Author

R. H. Hardin

Status

approved