A146444 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0100-0111 pattern in any orientation.

1, 1, 1, 1, 5, 17, 61, 319, 1657, 10301, 78887, 808895, 10915803, 187729525, 3870401483

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.1.1.1.0
.1.0.0.0.0.0.1.0
.1.0.0.0.0.0.1.1
.1.1.1.0.0.1.0.0
.0.0.1.0.0.1.1.1
.1.1.0.0.0.0.0.1
.0.1.0.0.0.0.0.1
.0.1.1.1.0.0.0.0

Crossrefs

Sequence in context: A273327 A273836 A273704 * A128073 A051736 A301560

Adjacent sequences: A146441 A146442 A146443 * A146445 A146446 A146447

Keyword

nonn

Author

R. H. Hardin

Status

approved