A146795 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-0100-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 5, 15, 25, 43, 117, 383, 1105, 5515, 16397, 82031, 330697, 1913291, 10092005, 75250999

Offset

1,8

Links

Table of n, a(n) for n=1..22.

Example

Maximal 8 X 8 example
.0.0.1.1.1.1.0.0
.0.0.0.0.1.0.0.0
.1.0.0.1.1.0.0.1
.1.0.1.0.0.1.1.1
.1.1.1.0.0.1.0.1
.1.0.0.1.1.0.0.1
.0.0.0.1.0.0.0.0
.0.0.1.1.1.1.0.0

Crossrefs

Sequence in context: A146779 A146859 A146835 * A166479 A108814 A290296

Adjacent sequences: A146792 A146793 A146794 * A146796 A146797 A146798

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved