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 A152906 Irregular triangle read by rows, numbers in A007318 repeated three times . 1

%I

%S 1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,1,1,1,1,1,1,3,3,3,3,3,3,1,1,1,1,1,1,4,

%T 4,4,6,6,6,4,4,4,1,1,1,1,1,1,5,5,5,10,10,10,10,10,10,5,5,5,1,1,1,1,1,

%U 1,6,6,6,15,15,15,20,20,20,15,15,15,6,6,6,1,1,1,1,1,1,7,7,7,21,21,21,35,35

%N Irregular triangle read by rows, numbers in A007318 repeated three times .

%C Diagonal sums : A078467 .

%F Sum_{k, 0<=k<=2n}T(n,k)=3*2^(n).

%e Triangle begins : 1,1,1 ; 1,1,1,1,1,1 ; 1,1,1,2,2,2,1,1,1 ; 1,1,1,3,3,3,3,3,3,1,1,1, ; 1,1,1,4,4,4,6,6,6,4,4,4,1,1,1 ; 1,1,1,5,5,5,10,10,10,10,10,10,5,5,5,1,1,1 ; ...

%Y Cf. A007318, A152905

%K nonn,tabf

%O 0,13

%A _Philippe DelĂ©ham_, Dec 14 2008

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Last modified September 19 12:50 EDT 2021. Contains 347556 sequences. (Running on oeis4.)