1,3
Table of n, a(n) for n=1..30.
For n = 4, A007955(n) = b(n): a(4) = b(1)*mu(1) + b(2)*mu(2) + b(3)* mu(3) + b(4)*mu(4) = 1*1 + 2*(-1) + 3*(-1) + 8*0 = -4.
Sequence in context: A118069 A089539 A117416 * A173317 A059811 A202409
Adjacent sequences: A174940 A174941 A174942 * A174944 A174945 A174946
sign
Jaroslav Krizek, Apr 02 2010
approved