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A146781 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0010-1010-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 5, 17, 37, 69, 119, 413, 1361, 4953, 21841, 100255, 486625, 2729263, 14571959, 98507721, 677047259 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.1.1.1.1.0.0.1.0
.1.0.1.0.1.1.1.0
.0.0.1.0.0.0.1.0
.0.1.0.0.0.1.0.0
.0.1.1.1.0.1.0.1
.0.1.0.0.1.1.1.1
.0.1.1.0.0.0.0.0
CROSSREFS
Sequence in context: A273250 A053755 A162373 * A338277 A348228 A107199
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified February 29 19:20 EST 2024. Contains 370428 sequences. (Running on oeis4.)