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A146798 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0110-0100-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 9, 49, 253, 1201, 4573, 30217, 286533, 2941009, 37746461, 678979449, 14880214645, 369497873441 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
LINKS
EXAMPLE
Maximal 8 X 8 example
.1.1.1.1.0.0.0.0
.0.1.0.0.0.0.0.1
.0.1.1.0.0.1.0.1
.1.0.0.0.0.1.1.1
.1.1.1.0.0.0.0.1
.1.0.1.0.0.1.1.0
.1.0.0.0.0.0.1.0
.0.0.0.0.1.1.1.1
CROSSREFS
Sequence in context: A081655 A181539 A224473 * A055428 A359186 A012231
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified February 21 19:37 EST 2024. Contains 370237 sequences. (Running on oeis4.)