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A147250
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11100-00100-00111 pattern in any orientation.
0
1, 1, 1, 1, 1, 3, 7, 15, 31, 125, 537, 2497, 11379, 73403, 564557, 5044749, 48150503, 565823439, 7944991263, 131881718303, 2468412664385
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.1.1.1.0.0.0
.0.1.0.0.1.0.0.0
.0.1.0.0.1.1.1.0
.0.1.1.1.0.0.0.0
.0.0.0.1.0.0.0.0
.0.0.0.1.0.0.0.0
.0.0.0.0.0.0.0.0
CROSSREFS
Sequence in context: A147094 A326518 A147285 * A336701 A066175 A132978
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved