OFFSET
0,2
COMMENTS
EXAMPLE
Triangle begins:
1;
3,1;
10,4,1;
56,21,5,1;
495,165,36,6,1;
6188,1820,364,55,7,1;
100947,26334,4845,680,78,8,1;
2035800,475020,80730,10626,1140,105,9,1; ...
PROG
(PARI) T(n, k)=binomial(n*(n-1)/2-k*(k-1)/2 +n-k+2, n-k)
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Paul D. Hanna, Jun 04 2005
STATUS
approved