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A124373
O.g.f.: A(x) = Sum_{n>=0} x^n / Product_{k=0..n} (1 - k*(k+1)/2*x).
+0
3
1, 1, 2, 6, 25, 135, 909, 7417, 71698, 806968, 10427825, 152915697, 2519879761, 46276398129, 940296067422, 21007099850230, 513172107841525, 13640345170943527, 392780078386164389, 12204609567437300313
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Maintained by
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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.
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