A146913 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1110-0111-0010 pattern in any orientation.

1, 1, 1, 3, 1, 5, 5, 13, 21, 65, 79, 331, 533, 2619, 5227, 28001, 61339, 390903, 1035837, 7813633, 23994329, 210020947, 748949341, 7662897803, 32193163805, 385464587673, 1890804496873, 26436803024815, 151320783550691

Offset

1,4

Links

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

Example

Maximal 8 X 8 example
.0.0.1.0.0.0.1.0
.0.1.1.1.0.1.1.1
.1.1.1.0.1.1.1.0
.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0
.0.1.1.1.0.1.1.1
.1.1.1.0.1.1.1.0
.0.1.0.0.0.1.0.0

Crossrefs

Sequence in context: A213952 A205873 A220479 * A146252 A181641 A049266

Adjacent sequences: A146910 A146911 A146912 * A146914 A146915 A146916

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved