A147424 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 10101-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 5, 13, 31, 123, 397, 1299, 7415, 48549, 328016, 2805259, 26286523, 261135019, 3222276941, 47592701035, 811402107260, 16468821744235, 385847309545373

Offset

1,7

Links

Table of n, a(n) for n=1..23.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.1.1
.0.0.0.0.0.0.0.1
.0.0.0.0.0.0.1.1
.0.0.0.0.0.0.0.1
.0.0.0.0.0.0.1.1
.0.1.0.1.0.1.0.0
.0.1.1.1.1.1.0.0

Crossrefs

Sequence in context: A147014 A146376 A146368 * A146057 A062403 A066688

Adjacent sequences: A147421 A147422 A147423 * A147425 A147426 A147427

Keyword

nonn

Author

R. H. Hardin

Status

approved