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A147357 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-0110-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 2, 3, 8, 13, 22, 45, 113, 275, 994, 2604, 9935, 31457, 134870, 529162, 2763867, 12621629, 78239209, 410491794, 3050461822 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,8
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.1.1.1.1.0.0
.0.0.0.1.1.0.0.0
.1.0.0.1.1.0.0.1
.1.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.1
.1.0.0.1.1.0.0.1
.0.0.0.1.1.0.0.0
.0.0.1.1.1.1.0.0
CROSSREFS
Sequence in context: A147329 A175148 A147417 * A004138 A213046 A262021
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified March 19 04:26 EDT 2024. Contains 370952 sequences. (Running on oeis4.)