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A146622
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1001-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 3, 5, 11, 17, 31, 67, 255, 681, 2579, 7475, 30835, 113699, 646479, 2916183, 18956135, 100069407, 770834039, 4965697461, 47266430445, 367691554109, 4176001047493, 38902939183671
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.0.1.0.0.1.0.0
.0.0.1.1.1.1.0.0
.1.1.0.0.0.0.1.1
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.1.1.0.0.0.0.1.1
.0.0.1.1.1.1.0.0
.0.0.1.0.0.1.0.0
CROSSREFS
Sequence in context: A085918 A267094 A336372 * A124179 A124173 A091610
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved