A146592 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 3, 23, 47, 75, 181, 675, 3025, 16403, 71953, 340893, 1986607, 14754733, 121306057, 1066980245, 9641071515, 101852566849, 1271193446821

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.1.0.0.0
.0.0.1.1.1.1.0.0
.0.1.0.1.1.0.1.0
.1.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.1
.0.1.0.1.1.0.1.0
.0.0.1.1.1.1.0.0
.0.0.0.1.0.0.0.0

Crossrefs

Sequence in context: A307530 A187094 A060651 * A107169 A297956 A298772

Adjacent sequences: A146589 A146590 A146591 * A146593 A146594 A146595

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved