A146384 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0110-1111 pattern in any orientation.

1, 1, 1, 1, 3, 10, 29, 100, 387, 2276, 17581, 155034, 1632582, 20304423, 321404215, 6545616593, 163131399978, 4942168957230, 181963337378973, 8263219425456168, 468671383459094714, 32913148405732346545

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.1.0.0.0
.0.0.0.1.1.0.0.0
.0.0.0.1.1.0.0.0
.0.1.1.0.1.0.0.1
.1.1.1.1.0.0.1.1
.0.0.0.0.0.0.1.1
.0.0.0.0.1.1.0.1
.0.0.0.1.1.1.1.0

Crossrefs

Sequence in context: A301879 A147062 A293155 * A166174 A365224 A365748

Adjacent sequences: A146381 A146382 A146383 * A146385 A146386 A146387

Keyword

nonn

Author

R. H. Hardin

Status

approved