A146905 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 5, 9, 13, 21, 41, 107, 243, 717, 1683, 4947, 13775, 49539, 165935, 690319, 2538097, 11779735, 49469745, 268313075, 1318481817, 8182984957

Offset

1,10

Links

Table of n, a(n) for n=1..30.

Example

Maximal 10 X 10 example
.0.0.0.0.0.1.0.0.0.0
.0.0.0.1.1.1.0.0.0.0
.0.0.0.0.1.1.1.0.0.0
.0.1.0.0.1.0.0.1.0.0
.0.1.1.1.0.0.0.1.1.1
.1.1.1.0.0.0.1.1.1.0
.0.0.1.0.0.1.0.0.1.0
.0.0.0.1.1.1.0.0.0.0
.0.0.0.0.1.1.1.0.0.0
.0.0.0.0.1.0.0.0.0.0

Crossrefs

Sequence in context: A187212 A141325 A248604 * A052282 A001993 A284829

Adjacent sequences: A146902 A146903 A146904 * A146906 A146907 A146908

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved