OFFSET
0,5
COMMENTS
Form the n X n Hankel matrices phi(i-j+1), 1<=i,j<=n for the Euler totient function and take characteristic polynomials. Triangle rows give coefficients of the characteristic polynomials of these matrices. (Construction described by Michael Somos in A064831). First column is a signed version of Hankel transform of Euler totient function, A056229.
EXAMPLE
Rows begin
1;
-1,1;
1,-3,1;
0,5,-7,1;
-4,22,23,-13,1;
-64,20,172,29,-19,1;
-240,-1120,-496,354,111,-29,1;
CROSSREFS
KEYWORD
sign,tabl
AUTHOR
Paul Barry, Jul 08 2005
STATUS
approved