OFFSET
1,3
COMMENTS
FORMULA
Infinite lower triangular matrix with A000203, sigma(n), in the main diagonal and the rest zeros.
EXAMPLE
First few rows of the triangle are:
1;
0, 3;
0, 0, 4;
0, 0, 0, 7;
0, 0, 0, 0, 6;
0, 0, 0, 0, 0, 12;
...
PROG
(PARI) for(n=1, 9, for(k=2, n, print1("0, ")); print1(sigma(n)", ")) \\ Charles R Greathouse IV, Feb 14 2013
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, May 16 2007
STATUS
approved