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A146275
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 110-111-111 pattern in any orientation.
0
1, 1, 3, 5, 9, 21, 93, 381, 1551, 7459, 56347, 473995, 4321181, 46467441, 656149111, 10982021937, 211884167843, 4855692779387, 137589956676037, 4668303218338689, 186691871576131219, 8904751201199219747, 514295038831216408667
OFFSET
1,3
EXAMPLE
Maximal 8 X 8 example
.0.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.1
.1.1.1.0.0.0.1.1
.0.0.0.1.1.1.0.0
.0.0.0.1.1.1.0.0
.1.1.0.1.1.0.1.1
.1.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.1
CROSSREFS
Sequence in context: A328525 A125517 A147038 * A089636 A241398 A373897
KEYWORD
nonn
AUTHOR
STATUS
approved