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A119743 Triangle read by rows: row n gives number of matchings of size 0<=k<=n (edges) in the complete graph on 2*n >= 2 vertices. +0
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1, 1, 1, 6, 3, 1, 15, 45, 15, 1, 28, 210, 420, 105, 1, 45, 630, 3150, 4725, 945, 1, 66, 1485, 13860, 51975, 62370, 10395, 1, 91, 3003, 45045, 315315, 945945, 945945, 135135, 1, 120, 5460, 120120, 1351350, 7567560, 18918900, 16216200, 2027025, 1, 153, 9180 (list; table; graph; listen)
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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.


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