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A147095 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation. 0
1, 1, 1, 1, 3, 3, 5, 7, 23, 43, 97, 209, 521, 1391, 4635, 14277, 54221, 189323, 860301, 3540691, 18022413, 86154579, 507402119, 2814410215, 19349048791, 125262392501 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,5
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.1.1.1.1.0
.0.0.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.0.0
.0.1.1.1.1.0.0.0
.0.0.0.0.0.0.0.0
CROSSREFS
Sequence in context: A240180 A169942 A215777 * A161626 A217648 A105888
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified March 28 17:25 EDT 2024. Contains 371254 sequences. (Running on oeis4.)