A147368 Number of n X n binary arrays with all ones connected only in a 0111-1100-0111 pattern in any orientation.

1, 1, 1, 9, 25, 57, 377, 5329, 73458, 886631, 17314150, 625360491, 29681577990, 1603029172207, 115029734984698

Offset

1,4

Links

Table of n, a(n) for n=1..15.

Example

Maximal 8 X 8 example
.1.0.1.0.0.0.1.0
.1.0.1.0.0.1.1.1
.1.1.1.0.0.1.0.1
.0.1.0.0.0.1.0.1
.0.0.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.0.0.1.1.0.1.0.1
.1.1.1.0.0.1.0.1

Crossrefs

Sequence in context: A113829 A147338 A147325 * A147497 A147353 A049740

Adjacent sequences: A147365 A147366 A147367 * A147369 A147370 A147371

Keyword

nonn

Author

R. H. Hardin

Status

approved