OFFSET
1,3
FORMULA
T(n,n) = A000005(n),
T(n,k) = 0 if n <> k.
EXAMPLE
First few rows of the triangle are:
1;
0, 2;
0, 0, 2;
0, 0, 0, 3;
0, 0, 0, 0, 2;
0, 0, 0, 0, 0, 4;
...
MAPLE
A130209 := proc(n, k)
if k = n then
numtheory[tau](n);
else
0;
end if;
end proc: # R. J. Mathar, Aug 06 2016
CROSSREFS
KEYWORD
AUTHOR
Gary W. Adamson, May 16 2007
STATUS
approved