A146440 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0100-0111 pattern in any orientation.

1, 1, 1, 1, 3, 9, 23, 51, 307, 2165, 14201, 97965, 1157935, 17853615, 293568879, 5611957605, 149513863877, 5116952638951, 205718918489939

Offset

1,5

Links

Table of n, a(n) for n=1..19.

Example

Maximal 8 X 8 example
.0.0.0.0.1.1.1.0
.0.0.0.0.0.0.1.0
.0.0.0.0.0.0.1.1
.0.0.0.0.0.1.0.0
.1.0.0.0.0.1.1.1
.1.0.0.1.1.0.0.1
.1.1.1.0.1.0.0.1
.0.0.1.0.1.1.1.0

Crossrefs

Sequence in context: A064551 A005783 A263330 * A244331 A183155 A305168

Adjacent sequences: A146437 A146438 A146439 * A146441 A146442 A146443

Keyword

nonn

Author

R. H. Hardin

Status

approved