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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 17 22:53 EDT 2019. Contains 327147 sequences. (Running on oeis4.)