A146935 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1111-1111 pattern in any orientation.

1, 1, 1, 3, 1, 5, 1, 10, 7, 62, 25, 420, 89, 3595, 559, 35290, 4332, 459986, 47525, 9058999, 720844, 232457113, 13515353, 7854920994, 345530332, 353173272787, 11945906159, 21075055556569, 546900316419

Offset

1,4

Links

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

Example

Maximal 8 X 8 example
.0.0.1.1.1.1.0.0
.0.0.1.1.1.1.0.0
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.1
.0.0.1.1.1.1.0.0
.0.0.1.1.1.1.0.0

Crossrefs

Sequence in context: A050354 A146434 A126213 * A360756 A133730 A330773

Adjacent sequences: A146932 A146933 A146934 * A146936 A146937 A146938

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved