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A145758
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only either three adjacent vertically or three adjacent horizontally.
0
1, 1, 7, 3, 46, 11, 1486, 401, 133777, 19881, 31874678, 3357350, 19385116046, 1369262857, 34450358764096, 1726253429208, 166321294438234974, 5602768757076743, 2202194423758663223078, 51308572928072165575
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
Table of n, a(n) for n=1..20.
CROSSREFS
Sequence in context: A271815 A194778 A272010 * A038269 A176328 A248279
Adjacent sequences: A145755 A145756 A145757 * A145759 A145760 A145761
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 17 2008
STATUS
approved

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Last modified September 30 13:07 EDT 2024. Contains 376364 sequences.
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