A147417 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1001-1111-0110 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 2, 3, 8, 13, 22, 43, 117, 277, 1026

Offset

1,8

Links

Table of n, a(n) for n=1..16.

Example

Maximal 8 X 8 example
.0.0.1.0.0.1.0.0
.0.0.1.1.1.1.0.0
.1.1.0.1.1.0.1.1
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0
.1.1.0.1.1.0.1.1
.0.0.1.1.1.1.0.0
.0.0.1.0.0.1.0.0

Crossrefs

Sequence in context: A142880 A147329 A175148 * A147357 A004138 A213046

Adjacent sequences: A147414 A147415 A147416 * A147418 A147419 A147420

Keyword

nonn

Author

R. H. Hardin

Status

approved