A146443 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0100-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 17, 41, 75, 189, 781, 2423, 8297, 41313, 246219, 1447691, 8722011, 58593249, 472152107, 3875447631

Offset

1,8

Links

Table of n, a(n) for n=1..21.

Example

Maximal 8 X 8 example
.1.0.0.0.0.0.1.1
.1.1.1.0.0.0.1.0
.0.0.1.0.1.1.1.0
.0.0.1.0.0.0.0.0
.0.0.0.0.0.1.0.0
.0.1.1.1.0.1.0.0
.0.1.0.0.0.1.1.1
.1.1.0.0.0.0.0.1

Crossrefs

Sequence in context: A267421 A166147 A028886 * A110226 A054819 A235743

Adjacent sequences: A146440 A146441 A146442 * A146444 A146445 A146446

Keyword

nonn

Author

R. H. Hardin

Status

approved