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A117380 Riordan array (1/(1-4*x*c(x)),xc(x)), c(x) the g.f. of A000108. +0
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1, 4, 1, 20, 5, 1, 104, 26, 6, 1, 548, 137, 33, 7, 1, 2904, 726, 178, 41, 8, 1, 15432, 3858, 954, 228, 50, 9, 1, 82128, 20532, 5100, 1242, 288, 60, 10, 1, 437444, 109361, 27233, 6701, 1601, 359, 71, 11, 1, 2331128, 582782, 145338, 35977, 8744, 2043, 442, 83, 12 (list; table; graph; listen)
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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.


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