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A146457
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0111-0010 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 3, 5, 15, 27, 85, 213, 947, 2889, 18347, 72469, 534735, 2688781, 25770975, 165859999, 2076582639, 17137608411, 273236370839, 2882703759335, 58601499839763
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.0.0.0.1.1.1.0.1
.0.0.0.0.1.0.1.1
.0.1.0.0.0.1.1.0
.0.1.1.0.0.0.1.0
.1.1.0.1.0.0.0.0
.1.0.1.1.1.0.0.0
.0.1.1.0.0.0.0.0
CROSSREFS
Sequence in context: A290230 A274638 A146244 * A051044 A353765 A358584
KEYWORD
nonn
AUTHOR
STATUS
approved