A146368 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 5, 13, 31, 121, 491, 3363, 25731, 206631, 2160127, 27517339, 451415709, 9252755391, 223401136265, 6569403284147, 238066497574789, 10727503069730095, 599422231400326251, 40846404956905305813, 3394537590955437316889

Offset

1,6

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.1.0.0.0
.0.0.0.0.1.1.0.0
.0.0.0.1.1.0.1.0
.0.0.1.0.1.0.1.1
.1.1.1.1.0.1.1.0
.0.1.0.0.1.0.1.0
.0.0.1.1.1.1.0.0
.0.0.0.1.0.0.0.0

Crossrefs

Sequence in context: A147022 A147014 A146376 * A147424 A146057 A062403

Adjacent sequences: A146365 A146366 A146367 * A146369 A146370 A146371

Keyword

nonn

Author

R. H. Hardin

Status

approved