A146392 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1100-0111 pattern in any orientation.

1, 1, 1, 1, 3, 9, 23, 77, 415, 2809, 21039, 202829, 2557861, 41110329, 812468577, 20241517719, 638623731453, 25413793552471

Offset

1,5

Links

Table of n, a(n) for n=1..18.

Example

Maximal 8 X 8 example
.0.0.0.0.1.1.1.0
.0.0.0.0.0.0.1.1
.0.0.0.0.0.0.0.1
.0.0.0.0.0.1.1.0
.1.0.0.0.0.0.1.1
.1.0.0.1.0.0.0.1
.1.1.0.1.1.0.0.1
.0.1.1.0.1.1.1.0

Crossrefs

Sequence in context: A196488 A108488 A018334 * A116659 A147508 A146472

Adjacent sequences: A146389 A146390 A146391 * A146393 A146394 A146395

Keyword

nonn

Author

R. H. Hardin

Status

approved