OFFSET
1,2
EXAMPLE
Triangle begins:
1;
3, 3;
4, 6, 4;
7, 10, 10, 7;
6, 17, 20, 17, 6;
12, 23, 37, 37, 23, 12;
8, 35, 60, 74, 60, 35, 8;
PROG
(PARI) t(n, k) = {if (k<1 || k>n, return (0)); if (k==1 || k==n, return (sigma(n))); return (t(n-1, k-1) + t(n-1, k)); }
tabl(nn) = {for (n=1, nn, for (k=1, n, print1(t(n, k), ", "); ); print(); ); } \\ Michel Marcus, May 19 2013
CROSSREFS
KEYWORD
AUTHOR
Joseph L. Pe, Sep 30 2002
EXTENSIONS
More terms from Michel Marcus, May 19 2013
STATUS
approved