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A003409
3C(2n-1,n).
(Formerly M2814)
+0
3
3, 9, 30, 105, 378, 1386, 5148, 19305, 72930, 277134, 1058148, 4056234, 15600900, 60174900, 232676280, 901620585, 3500409330, 13612702950, 53017895700, 206769793230
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Last modified December 17 13:29 EST 2009. Contains 170826 sequences.
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