A146000 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 3X3 plus 2,1 2,2 2,3 1,2 3,2.

1, 1, 2, 3, 6, 13, 41, 134, 523, 2341, 13112, 85330, 657274, 5867785, 62935391, 796238629, 11963244988, 210625730574, 4398387347279, 108485411030401, 3172272297097957, 109373622124547205, 4459641160503515254

Offset

1,3

Links

Table of n, a(n) for n=1..23.

Example

Maximal 8 X 8 example
.0.0.0.1.0.0.0.0
.0.0.1.1.1.0.1.0
.0.1.0.1.0.1.1.1
.1.1.1.0.1.0.1.0
.0.1.0.1.1.1.0.0
.0.0.1.0.1.0.1.0
.0.1.1.1.0.1.1.1
.0.0.1.0.0.0.1.0

Crossrefs

Sequence in context: A137273 A135967 A290248 * A134737 A030733 A335288

Adjacent sequences: A145997 A145998 A145999 * A146001 A146002 A146003

Keyword

nonn

Author

R. H. Hardin, Oct 26 2008

Status

approved