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A084602 Triangle, read by rows, where the n-th row lists the (2n+1) coefficients of (1+x+3x^2)^n. +0
3
1, 1, 1, 3, 1, 2, 7, 6, 9, 1, 3, 12, 19, 36, 27, 27, 1, 4, 18, 40, 91, 120, 162, 108, 81, 1, 5, 25, 70, 185, 331, 555, 630, 675, 405, 243, 1, 6, 33, 110, 330, 726, 1441, 2178, 2970, 2970, 2673, 1458, 729, 1, 7, 42, 161, 539, 1386, 3157, 5797, 9471, 12474, 14553 (list; table; graph; listen)
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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.


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