%I #5 Sep 08 2013 13:30:52
%S 1,1,1,1,2,1,1,4,4,1,1,11,20,11,1,1,67,276,276,67,1
%N f-Pascal's triangle where f(n) = n*(n+1)/2 = A000217(n).
%F T(n,k) = f(T(n-1,k-1)) + f(T(n-1,k))where f(n) = n*(n+1)/2 = A000217(n); T(0;0) = 1 ; T(n,k) = 0 if k<0 or if k>n.
%e Triangle begins:
%e 1;
%e 1, 1;
%e 1, 2, 1;
%e 1, 4, 4, 1;
%e 1, 11, 20, 11, 1;
%e 1, 67, 276, 276, 67, 1;
%Y Cf. A007318.
%K nonn,tabl
%O 0,5
%A _Philippe Deléham_, Jun 14 2006