OFFSET
1,6
FORMULA
T(n,n) = A000010(n).
T(n,k) = 0, if k <> n.
EXAMPLE
First few rows of the triangle are:
1;
0, 1;
0, 0, 2;
0, 0, 0, 2;
0, 0, 0, 0, 4;
...
MAPLE
PROG
(PARI) for(n=1, 9, for(k=2, n, print1("0, ")); print1(eulerphi(n)", ")) \\ Charles R Greathouse IV, Feb 19 2013
CROSSREFS
KEYWORD
AUTHOR
Gary W. Adamson, May 16 2007
STATUS
approved