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%I #8 Sep 30 2018 04:01:09
%S 1,1,1,1,2,-1,4,-1,2,0,6,-7,8,-2,2,-1,8,-8,12,-10,4,4,12,-21,12,0,6,
%T -8,16,-18,22,-15,4,4,8,-20,24,-6,6,-18,24,-24,30,-18,4,10,24,-51,26,
%U -10,12,-8,28,-28,22,-24,12,8,30,-60
%N Row sums of inverse of number triangle A(n,k) = 1/Euler_phi(n+1) if k <= n <= 2k, 0 otherwise.
%Y Row sums of A127771.
%K sign
%O 0,5
%A _Paul Barry_, Jan 28 2007
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