A147355 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0110-0110-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 6, 9, 38, 25, 340, 57, 1815, 551, 17400, 8604, 372235, 122881, 11641876, 1647352, 359458545, 42868635, 13529698097, 1998622860

Offset

1,8

Links

Table of n, a(n) for n=1..25.

Example

Maximal 8 X 8 example
.0.0.1.1.1.1.0.0
.0.0.0.1.1.0.0.0
.1.0.0.1.1.0.0.1
.1.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.1
.1.0.0.1.1.0.0.1
.0.0.0.1.1.0.0.0
.0.0.1.1.1.1.0.0

Crossrefs

Sequence in context: A057397 A038263 A004989 * A154139 A330983 A299914

Adjacent sequences: A147352 A147353 A147354 * A147356 A147357 A147358

Keyword

nonn

Author

R. H. Hardin

Status

approved