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A162059
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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
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0
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2, 6, 18, 100, 691, 6729, 78478, 1102775, 17908058, 330070220, 6865933571, 158038101259, 4006358927524, 110885649721312
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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