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A146244
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-010 pattern in any orientation.
0
1, 1, 1, 1, 3, 5, 15, 27, 71, 187, 699, 2485, 10357, 44365, 244417, 1388829, 9098951, 61499491, 509779147, 4539566193, 48133963115, 521951245563, 6723339029473, 91767923636107, 1516162394272495, 26177605341894705, 536020923137750911
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.1.0
.0.0.1.0.0.1.1.1
.0.1.1.1.0.1.1.0
.0.0.1.1.0.0.0.0
.0.0.0.0.1.1.0.0
.0.1.1.0.1.1.1.0
.1.1.1.0.0.1.0.0
.0.1.0.0.0.0.0.0
CROSSREFS
Sequence in context: A289881 A290230 A274638 * A146457 A051044 A353765
KEYWORD
nonn
AUTHOR
STATUS
approved