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A146010
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation.
0
1, 1, 1, 1, 1, 1, 2, 5, 10, 17, 41, 113, 371, 1287, 4551, 19076, 90597, 483533, 2906704, 18699832, 136658284, 1121369297, 10362476826, 106541327541, 1220122346197, 15486094270737, 222171208299640, 3540873297034591, 63467027877319177
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.0.0.0.0
.0.0.0.1.1.1.0.0
.0.0.0.1.0.0.1.0
.1.1.1.0.0.0.1.0
.0.1.0.0.0.1.1.1
.0.1.0.0.1.0.0.0
.0.0.1.1.1.0.0.0
.0.0.0.0.1.0.0.0
CROSSREFS
Sequence in context: A173112 A213299 A172114 * A077631 A350878 A354246
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 26 2008
STATUS
approved