A146385 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-1111 pattern in any orientation.

1, 1, 1, 1, 1, 2, 3, 6, 11, 18, 47, 140, 456, 1541, 4859, 19189, 88716, 477610, 2733493, 16377324, 107101430, 821473645, 7043526337, 68487711150, 704897480220, 8110505465029, 102402264000312, 1483223734585349, 23560655031075409

Offset

1,6

Links

Table of n, a(n) for n=1..29.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.1.1.1.1.0.0
.0.1.0.1.1.0.1.0
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0
.0.1.0.1.1.0.1.0
.0.0.1.1.1.1.0.0
.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A054186 A347212 A032156 * A039827 A004135 A288583

Adjacent sequences: A146382 A146383 A146384 * A146386 A146387 A146388

Keyword

nonn

Author

R. H. Hardin

Status

approved