A146451 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0110-0011 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 11, 23, 43, 147, 439, 1275, 4541, 20063, 98055, 505355, 2950723, 18858815, 128249637, 989759495, 8490117733

Offset

1,8

Links

Table of n, a(n) for n=1..22.

Example

Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.1.0.0.0.1.1.0.0
.1.1.0.1.1.0.0.0
.0.1.1.0.0.1.0.0
.0.0.1.0.0.1.1.0
.0.0.0.1.1.0.1.1
.0.0.1.1.0.0.0.1
.0.1.1.0.0.0.0.0

Crossrefs

Sequence in context: A352494 A228444 A191235 * A195043 A029468 A198588

Adjacent sequences: A146448 A146449 A146450 * A146452 A146453 A146454

Keyword

nonn

Author

R. H. Hardin

Status

approved