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A117375 Riordan array (1/(1-3x*c(x)),xc(x)), c(x) the g.f. of A000108. +0
3
1, 3, 1, 12, 4, 1, 51, 17, 5, 1, 222, 74, 23, 6, 1, 978, 326, 104, 30, 7, 1, 4338, 1446, 468, 142, 38, 8, 1, 19323, 6441, 2103, 657, 189, 47, 9, 1, 86310, 28770, 9447, 3006, 903, 246, 57, 10, 1, 386250, 128750, 42440, 13670, 4223, 1217, 314, 68, 11, 1, 1730832 (list; table; graph; listen)
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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.


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