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A147267 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 27, 51, 87, 231, 993, 2999, 11701, 48597, 296399, 1545465, 9380053, 56658941, 454413807 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,8
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.1.0.1.1.0.0
.0.0.1.1.0.1.0.0
.1.1.1.0.0.1.1.1
.1.0.0.0.0.0.1.0
.0.1.0.0.0.0.0.1
.1.1.1.0.0.1.1.1
.0.0.1.0.1.1.0.0
.0.0.1.1.0.1.0.0
CROSSREFS
Sequence in context: A108163 A108114 A172969 * A071183 A025414 A201276
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified December 9 01:07 EST 2023. Contains 367681 sequences. (Running on oeis4.)