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A171999 Triangle of trinomial coefficients. 0

%I #5 Mar 22 2013 14:58:34

%S 1,1,2,1,3,6,1,4,6,12,1,5,10,20,30,1,6,15,20,30,60,90,1,7,21,35,42,

%T 105,140,210,1,8,28,56,70,168,280,420,560,1,9,36,72,84,126,252,504,

%U 630,756,1260,1680,1,10,45,90,120,210,252,360,840,1260,2520,3150,4200,1,11,55

%N Triangle of trinomial coefficients.

%C Number of numbers in row n is given by A086753.

%C Row sums: A092255.

%C See A046816, Pascal's pyramid of trinomial coefficients.

%e First six rows:

%e 1

%e 1...2

%e 1...3...6

%e 1...4...6....12

%e 1...5...10...20...30

%e 1...6...15...20...30...60...90

%Y Cf. A036038, A046816, A092255.

%K nonn,tabf

%O 1,3

%A _Clark Kimberling_, Jan 21 2010

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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)