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A147432 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-0101 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 21, 39, 91, 251, 693, 2197, 6837, 23871, 89603, 379705, 1672695, 8302957, 42265243, 244734851, 1469763313 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,9
LINKS
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.1.0.1.0.0
.0.0.0.1.1.1.1.0.0
.0.0.0.1.0.1.0.1.1
.0.1.1.0.0.0.1.1.0
.1.1.0.0.0.0.0.1.1
.0.1.1.0.0.0.1.1.0
.1.1.0.1.0.1.0.0.0
.0.0.1.1.1.1.0.0.0
.0.0.1.0.1.0.0.0.0
CROSSREFS
Sequence in context: A032606 A098482 A342422 * A018367 A146369 A146377
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified March 28 14:38 EDT 2024. Contains 371254 sequences. (Running on oeis4.)