A146699 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 21, 585, 1175, 13235, 33591, 904833, 2777683, 243371641, 949834779, 144264575111, 703897326167, 173395824962595, 1047822171303933, 492478720057422059, 3690926761734236233

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.1.0
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.1

Crossrefs

Sequence in context: A146627 A146635 A146832 * A146707 A146643 A146715

Adjacent sequences: A146696 A146697 A146698 * A146700 A146701 A146702

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved