A147436 Number of n X n binary arrays with all ones connected only in a 1010-1111-1010 pattern in any orientation.

1, 1, 1, 9, 25, 89, 611, 6905, 105540, 1741627, 42117698, 1578103851, 82708302532, 5707546949411

Offset

1,4

Links

Table of n, a(n) for n=1..14.

Example

Maximal 8 X 8 example
.1.1.1.0.0.1.0.1
.0.1.0.0.1.1.1.1
.1.1.1.0.0.1.0.1
.0.1.0.0.0.0.0.0
.0.0.1.0.0.0.0.0
.0.1.1.1.0.1.0.1
.0.0.1.0.1.1.1.1
.0.1.1.1.0.1.0.1

Crossrefs

Sequence in context: A066137 A269662 A147428 * A189118 A075067 A075064

Adjacent sequences: A147433 A147434 A147435 * A147437 A147438 A147439

Keyword

nonn

Author

R. H. Hardin

Status

approved