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A027907 Triangle of trinomial coefficients T(n,k) (n >= 0, 0<=k<=2n), read by rows (n-th row is obtained by expanding (1+x+x^2)^n). +0
94
1, 1, 1, 1, 1, 2, 3, 2, 1, 1, 3, 6, 7, 6, 3, 1, 1, 4, 10, 16, 19, 16, 10, 4, 1, 1, 5, 15, 30, 45, 51, 45, 30, 15, 5, 1, 1, 6, 21, 50, 90, 126, 141, 126, 90, 50, 21, 6, 1, 1, 7, 28, 77, 161, 266, 357, 393, 357, 266, 161, 77, 28, 7, 1, 1, 8, 36, 112, 266 (list; graph; listen)
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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.


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