A146393 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1100-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 43, 141, 419, 1255, 5087, 24913, 131971, 734375, 4818949, 34664741, 269727721, 2371934855, 24159321229, 274622983853

Offset

1,8

Links

Table of n, a(n) for n=1..24.

Example

Maximal 8 X 8 example
.0.1.1.1.0.0.0.0
.1.0.0.1.1.0.0.0
.1.0.0.0.1.0.0.0
.1.1.0.0.0.1.1.0
.0.1.1.0.0.0.1.1
.0.0.0.1.0.0.0.1
.0.0.0.1.1.0.0.1
.0.0.0.0.1.1.1.0

Crossrefs

Sequence in context: A147371 A075188 A051894 * A147431 A329145 A348377

Adjacent sequences: A146390 A146391 A146392 * A146394 A146395 A146396

Keyword

nonn

Author

R. H. Hardin

Status

approved