A147353 Number of n X n binary arrays with all ones connected only in a 0110-0110-1111 pattern in any orientation.

1, 1, 1, 9, 25, 57, 551, 8604, 122881, 1647352, 42868635, 1998622860, 114645170079, 7404803994915

Offset

1,4

Links

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

Example

Maximal 8 X 8 example
.1.1.1.1.0.0.0.0
.0.1.1.0.0.0.0.1
.0.1.1.0.0.1.1.1
.0.0.0.0.0.1.1.1
.0.0.0.0.0.0.0.1
.1.1.1.1.0.1.1.0
.0.1.1.0.0.1.1.0
.0.1.1.0.1.1.1.1

Crossrefs

Sequence in context: A147325 A147368 A147497 * A049740 A147405 A111440

Adjacent sequences: A147350 A147351 A147352 * A147354 A147355 A147356

Keyword

nonn

Author

R. H. Hardin

Status

approved