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A162059
Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in nondecreasing order, and no more than 4 ones in any row or column
0
2, 6, 18, 100, 691, 6729, 78478, 1102775, 17908058, 330070220, 6865933571, 158038101259, 4006358927524, 110885649721312
OFFSET
1,1
CROSSREFS
Sequence in context: A028857 A052687 A302546 * A162060 A162061 A162062
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 25 2009
STATUS
approved