A056229 - OEIS

%I #3 Mar 30 2012 16:48:51

%S 1,1,0,-4,64,-240,-2656,15360,-88064,-1714176,-28506112,59061248,

%T 1975595008,-107448238080,858018086912,12209125720064,61138306793472,

%U -297002777247744,-7586668200067072,309144292445913088

%N Hankel transform of Euler totient function (A000010).

%Y See A001906 for definition of Hankel transform.

%K sign

%O 1,4

%A _N. J. A. Sloane_, Aug 06 2000