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A147464 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1111-0011 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 21, 43, 107, 271, 771 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,9
LINKS
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.0.1.1.0.0
.0.0.0.1.1.1.1.0.0
.0.0.0.1.1.0.0.1.1
.0.1.1.0.0.0.0.1.1
.0.1.1.0.0.0.1.1.0
.1.1.0.0.0.0.1.1.0
.1.1.0.0.1.1.0.0.0
.0.0.1.1.1.1.0.0.0
.0.0.1.1.0.0.0.0.0
CROSSREFS
Sequence in context: A146377 A147501 A147335 * A146058 A155354 A136219
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified February 23 10:04 EST 2024. Contains 370276 sequences. (Running on oeis4.)