1,1

a(n) = (1/n)*Sum_{d|n} 2^(d^2)*moebius(n/d).

Sequence in context: A064607 A005345 A077746 this_sequence A120381 A042359 A015174

Adjacent sequences: A159031 A159032 A159033 this_sequence A159035 A159036 A159037

easy,nonn

Paul Hanna, Vladeta Jovovic (vladeta(AT)eunet.yu), Apr 02 2009