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A147287 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0001-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 25, 41, 113, 265, 1045, 2597, 10607, 34895, 213407, 913033, 6860785, 33581603 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,9
LINKS
EXAMPLE
Maximal 9 X 9 example
.1.0.0.0.0.0.0.1.1
.1.1.0.0.0.1.1.1.0
.0.1.0.0.0.1.0.0.0
.0.1.1.1.0.1.0.0.0
.0.0.0.0.0.0.0.0.0
.0.0.0.1.0.1.1.1.0
.0.0.0.1.0.0.0.1.0
.0.1.1.1.0.0.0.1.1
.1.1.0.0.0.0.0.0.1
CROSSREFS
Sequence in context: A242074 A366428 A195564 * A240758 A031331 A236838
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified July 18 10:00 EDT 2024. Contains 374378 sequences. (Running on oeis4.)