A147389 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 10001-11111-00100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 4, 1, 6, 1, 13, 3, 36, 9, 103, 20, 390, 57, 1676, 190, 7624, 629

Offset

1,9

Links

Table of n, a(n) for n=1..26.

Example

Maximal 9 X 9 example
.0.0.1.0.0.0.1.0.0
.0.0.1.1.1.1.1.0.0
.1.1.0.0.1.0.0.1.1
.0.1.0.0.0.0.0.1.0
.0.1.1.0.0.0.1.1.0
.0.1.0.0.0.0.0.1.0
.1.1.0.0.1.0.0.1.1
.0.0.1.1.1.1.1.0.0
.0.0.1.0.0.0.1.0.0

Crossrefs

Sequence in context: A130892 A353318 A239871 * A147008 A147365 A147064

Adjacent sequences: A147386 A147387 A147388 * A147390 A147391 A147392

Keyword

nonn

Author

R. H. Hardin

Status

approved