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A147447
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11000-01100-00110-00011 pattern in any orientation.
0
1, 1, 1, 1, 1, 3, 7, 13, 39, 123, 461, 2371, 13249, 80863, 611487, 5648891, 61162833, 795442861, 12190308735, 215424452659
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.1.0.0.0
.0.0.0.0.1.1.0.0
.0.0.1.1.0.1.1.0
.0.0.0.1.1.0.1.1
.0.0.0.0.1.1.0.1
.0.0.0.0.0.1.1.0
CROSSREFS
Sequence in context: A145956 A155225 A051842 * A062605 A191974 A174241
KEYWORD
nonn
AUTHOR
STATUS
approved