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%I #3 Sep 08 2013 13:31:32
%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 Deléham_, Dec 14 2008