A146448 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0110-0011 pattern in any orientation.

1, 1, 1, 1, 3, 7, 15, 49, 233, 1205, 7091, 56369, 554977, 6653663, 98474615, 1800719003, 40485995917, 1128941883627, 39031781085873, 1652786153476941

Offset

1,5

Links

Table of n, a(n) for n=1..20.

Example

Maximal 8 X 8 example
.0.1.1.0.0.1.0.0
.1.0.1.1.0.1.1.0
.1.1.0.1.1.0.1.1
.0.1.1.0.0.1.0.1
.0.0.1.0.0.1.1.0
.1.1.0.1.1.0.1.1
.0.1.1.0.1.1.0.1
.0.0.1.1.0.1.1.0

Crossrefs

Sequence in context: A151401 A080567 A276969 * A192169 A290470 A268061

Adjacent sequences: A146445 A146446 A146447 * A146449 A146450 A146451

Keyword

nonn

Author

R. H. Hardin

Status

approved