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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. 0
1, 1, 2, 3, 6, 13, 41, 134, 523, 2341, 13112, 85330, 657274, 5867785, 62935391, 796238629, 11963244988, 210625730574, 4398387347279, 108485411030401, 3172272297097957, 109373622124547205, 4459641160503515254 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 7 08:56 EDT 2021. Contains 343636 sequences. (Running on oeis4.)