A146584 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1100-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 9, 15, 53, 69, 367, 797, 5383, 14177, 132187, 419443, 4770865, 18981007, 272701021, 1381813173, 25671154071, 163453499965

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.1.0.0.0.0.1.1.1
.1.0.0.0.1.1.0.0
.1.1.1.0.0.1.0.0
.0.1.0.0.0.0.0.0
.0.0.0.0.0.0.1.0
.0.0.1.0.0.1.1.1
.0.0.1.1.0.0.0.1
.1.1.1.0.0.0.0.1

Crossrefs

Sequence in context: A283676 A305219 A039314 * A276414 A175033 A043137

Adjacent sequences: A146581 A146582 A146583 * A146585 A146586 A146587

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved