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A145791 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only either four adjacent vertically or four adjacent horizontally. 0
1, 1, 1, 3, 1, 6, 1, 17, 26, 113, 318, 1310, 4072, 21570, 65328, 442636, 1558383, 13750703, 69409037, 646392443, 4686057331, 48049954607, 457665821401, 5254108049909, 63960030819910, 855193502729867 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..26.

CROSSREFS

Sequence in context: A165552 A067231 A218971 * A322041 A130302 A270103

Adjacent sequences:  A145788 A145789 A145790 * A145792 A145793 A145794

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 19 2008

STATUS

approved

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Last modified August 24 23:01 EDT 2019. Contains 326314 sequences. (Running on oeis4.)