OFFSET
0,5
FORMULA
T(n,k) = Sum_{j=0..n-k} C(2k,j).
EXAMPLE
Triangle begins
1,
1, 1,
1, 3, 1,
1, 4, 5, 1,
1, 4, 11, 7, 1,
1, 4, 15, 22, 9, 1,
1, 4, 16, 42, 37, 11, 1
PROG
(PARI) tabl(nn) = for (n=0, nn, for (k=0, n, print1(sum(j=0, n-k, binomial(2*k, j)), ", ")); print(); ); \\ Michel Marcus, Nov 05 2016
CROSSREFS
KEYWORD
AUTHOR
Paul Barry, Oct 22 2006
STATUS
approved