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A146907 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation. 0
1, 1, 1, 3, 1, 3, 1, 5, 7, 23, 21, 73, 67, 331, 379, 2159, 3073, 18347, 29787, 200555, 362821, 2889871, 5926103, 54516713, 129199873, 1351622999, 3735869433, 44518336027, 139642079573, 1907609753527 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,4
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.1.0.0.0.1.0
.1.1.1.0.1.1.1.0
.0.1.1.1.0.1.1.1
.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0
.1.1.1.0.1.1.1.0
.0.1.1.1.0.1.1.1
.0.1.0.0.0.1.0.0
CROSSREFS
Sequence in context: A328573 A369066 A283461 * A322865 A238694 A320221
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified March 29 10:22 EDT 2024. Contains 371268 sequences. (Running on oeis4.)