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A145764 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only either three adjacent vertically or three adjacent horizontally. 0
1, 1, 5, 5, 24, 73, 566, 2483, 32841, 234437, 5307036, 61459976, 2279718182, 44700555075, 2739362168120, 88170556642974, 8988213154883058 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..17.

CROSSREFS

Sequence in context: A175713 A090936 A262117 * A165826 A256693 A255458

Adjacent sequences:  A145761 A145762 A145763 * A145765 A145766 A145767

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 17 2008

STATUS

approved

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Last modified May 19 12:09 EDT 2022. Contains 353833 sequences. (Running on oeis4.)