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A146374 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 5, 1, 29, 11, 899, 319, 40083, 6733, 3227138, 377583, 692995026, 72214151, 372813760407, 27637627655, 428803889872888, 21622063008199, 1097097155523363601, 40200348993008961, 6558007935506472623330 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,5
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0
CROSSREFS
Sequence in context: A140713 A125906 A146414 * A188647 A232015 A214882
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified February 23 09:02 EST 2024. Contains 370276 sequences. (Running on oeis4.)