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A146718 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1111-1000 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 7, 13, 27, 41, 107, 327, 1681, 5451, 24597, 80545, 454313, 2226033, 18080203, 106915629 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,9
LINKS
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.0.1.0.0.0
.0.0.1.1.1.1.0.0.0
.0.1.0.0.1.1.0.0.0
.0.1.0.0.0.0.1.1.1
.0.1.1.0.0.0.1.1.0
.1.1.1.0.0.0.0.1.0
.0.0.0.1.1.0.0.1.0
.0.0.0.1.1.1.1.0.0
.0.0.0.1.0.0.0.0.0
CROSSREFS
Sequence in context: A337433 A067870 A147258 * A146646 A096194 A160889
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified March 18 22:56 EDT 2024. Contains 370952 sequences. (Running on oeis4.)