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%I #3 Sep 08 2013 13:31:32
%S 1,1,1,1,1,1,1,1,2,2,1,1,1,1,3,3,3,3,1,1,1,1,4,4,6,6,4,4,1,1,1,1,5,5,
%T 10,10,10,10,5,5,1,1,1,1,6,6,15,15,20,20,15,15,6,6,1,1,1,1,7,7,21,21,
%U 35,35,35,35,21,21,7,7,1,1,1,1,88,28,28,56,56,70,70,56,56,28,28,8,8,1,1
%N Irregular triangle read by rows, numbers in A007318 repeated .
%C Diagonal sums : A097333 .
%F Sum_{k, 0<=k<=2n}T(n,k)=2^(n+1).
%e Triangle begins : 1,1 ; 1,1,1,1 ; 1,1,2,2,1,1 ; 1,1,3,3,3,3,1,1, ; 1,1,4,4,6,6,4,4,1,1 ; 1,1,5,5,10,10,10,10,5,5,1,1 ; ...
%Y Cf. A000079,
%K nonn,tabf
%O 0,9
%A _Philippe Deléham_, Dec 14 2008
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