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A008549
Number of ways of choosing at most n-1 items from a set of size 2n+1.
+0
15
0, 1, 6, 29, 130, 562, 2380, 9949, 41226, 169766, 695860, 2842226, 11576916, 47050564, 190876696, 773201629, 3128164186, 12642301534, 51046844836, 205954642534, 830382690556, 3345997029244, 13475470680616
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Maintained by
N. J. A. Sloane
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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.
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