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Search: id:A162110
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A162110 Number of nXn symmetric binary arrays with rows, considered as graycode numbers, in strictly increasing order, and no more than 2 ones in any row or column +0
1
2, 4, 8, 21, 53, 145, 405, 1180, 3562, 11030, 35306, 115338, 387443, 1326992, 4650201, 16604351, 60443887, 223971602, 844095896, 3234044019, 12582749734, 49703821584, 199149007691, 809153896365, 3331563584486 (list; graph; listen)
OFFSET

1,1
CROSSREFS

Sequence in context: A059731 A001315 A002040 this_sequence A108071 A055876 A065847

Adjacent sequences: A162107 A162108 A162109 this_sequence A162111 A162112 A162113

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Jun 25 2009

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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