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A147063 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01010-11111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 2, 3, 6, 9, 16, 23, 74, 177, 647, 1682, 5837, 15849, 74186, 276554, 1634940, 7124985, 45487535, 222097984, 1721224041, 10469414217, 99805923832 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.1.1.1.1.1.0
.0.0.0.1.0.1.0.1
.1.0.0.0.0.0.1.1
.1.1.0.0.0.0.0.1
.1.0.0.0.0.0.1.1
.1.1.0.0.0.0.0.1
.1.0.1.0.1.0.0.0
.0.1.1.1.1.1.0.0
CROSSREFS
Sequence in context: A051057 A147364 A147227 * A357640 A007865 A052812
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)