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A146877 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0100-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 13, 37, 65, 121, 421, 1309, 3649, 15177, 81237, 474405, 2569641, 13240801, 84039101, 586237485 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,8
LINKS
EXAMPLE
Maximal 8 X 8 example
.1.0.0.0.0.1.1.1
.1.0.1.0.0.1.0.0
.1.1.1.0.1.1.1.0
.0.0.1.0.0.0.0.0
.0.0.0.0.0.1.0.0
.0.1.1.1.0.1.1.1
.0.0.1.0.0.1.0.1
.1.1.1.0.0.0.0.1
CROSSREFS
Sequence in context: A118071 A307192 A147207 * A309720 A233435 A049742
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified April 25 09:25 EDT 2024. Contains 371967 sequences. (Running on oeis4.)