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A147197 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0100-0111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 5, 5, 9, 17, 69, 103, 261, 509, 2919, 6029, 27429, 73047, 523687, 1587321, 10285447, 37481773, 334798483, 1395159927, 13476048417, 66683704581, 829426776361 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.1.0.0.0
.0.0.1.1.1.0.0.0
.0.0.1.0.0.1.1.0
.0.1.1.0.0.1.0.0
.0.0.0.1.1.1.0.0
.0.0.0.1.0.0.0.0
.0.0.0.0.0.0.0.0
CROSSREFS
Sequence in context: A058491 A058584 A324792 * A323301 A147047 A173322
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified March 29 10:59 EDT 2024. Contains 371277 sequences. (Running on oeis4.)