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A036606 Triangle of coefficients of generating function of 4-ary rooted trees of height at most n. +0
2
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3, 5, 6, 8, 9, 11, 11, 12, 11, 11, 9, 8, 6, 5, 3, 2, 1, 1, 1, 1, 1, 2, 4, 8, 14, 26, 44, 76, 125, 206, 327, 521, 802, 1231, 1845, 2742, 3987, 5748, 8124, 11364, 15615, 21212, 28336, 37412, 48597, 62368, 78810, 98359 (list; graph; listen)
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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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