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A007799 Triangle read by rows: Whitney numbers of second kind a(n,k), n >= 1, k >= 0, for the star poset. +0
2
1, 1, 1, 1, 2, 2, 1, 1, 3, 6, 9, 5, 1, 4, 12, 30, 44, 26, 3, 1, 5, 20, 70, 170, 250, 169, 35, 1, 6, 30, 135, 460, 1110, 1689, 1254, 340, 15, 1, 7, 42, 231, 1015, 3430, 8379, 13083, 10408, 3409, 315, 1, 8, 56, 364, 1960, 8540, 28994, 71512, 114064, 96116, 36260 (list; graph; listen)
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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.


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