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A147251
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11100-00100-00111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 3, 5, 11, 17, 47, 101, 251, 493, 1875, 5405, 23441, 71481, 351927, 1342835, 7434603, 30903299, 201078705, 1028625049
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.0.1.1.1.0
.0.0.0.0.0.1.0.0.1
.0.0.0.1.1.1.0.0.1
.0.0.1.0.0.0.1.1.1
.0.0.1.0.0.0.1.0.0
.1.1.1.0.0.0.1.0.0
.1.0.0.1.1.1.0.0.0
.1.0.0.1.0.0.0.0.0
.0.1.1.1.0.0.0.0.0
CROSSREFS
Sequence in context: A019386 A283064 A154622 * A146473 A282961 A165446
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved