OFFSET
0,2
COMMENTS
FORMULA
Number triangle T(n,k) = Sum_{i=0..n-k} binomial(i+k,k)^2.
EXAMPLE
Rows start
1;
2, 1;
3, 5, 1;
4, 14, 10, 1;
5, 30, 46, 17, 1;
6, 55, 146, 117, 26, 1;
PROG
(PARI) T(n, k) = sum(i=0, n-k, binomial(i+k, k)^2);
tabl(nn) = for (n=0, nn, for (k=0, n, print1(T(n, k), ", ")); print(); ); \\ Michel Marcus, Dec 03 2016
CROSSREFS
KEYWORD
AUTHOR
Paul Barry, Jul 15 2005
STATUS
approved