A146421 Number of n X n binary arrays with all ones connected only in a 1010-1111 pattern in any orientation.

1, 1, 1, 29, 229, 1773, 39925, 1086663, 55544427, 4442151653, 513575103485

Offset

1,4

Links

Table of n, a(n) for n=1..11.

Example

Maximal 8 X 8 example
.1.1.0.1.0.0.1.1
.1.0.1.1.0.0.0.1
.1.1.0.1.0.0.1.1
.1.0.1.1.0.0.0.1
.0.1.0.0.1.0.1.0
.1.1.0.1.1.0.1.1
.0.1.0.0.1.0.1.0
.1.1.0.1.1.0.1.1

Crossrefs

Sequence in context: A142066 A091631 A244767 * A093401 A228408 A042636

Adjacent sequences: A146418 A146419 A146420 * A146422 A146423 A146424

Keyword

nonn

Author

R. H. Hardin

Status

approved