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a(n) = mu(n) * A000217(n).
1

%I #10 Feb 26 2020 15:59:41

%S 1,-3,-6,0,-15,21,-28,0,0,55,-66,0,-91,105,120,0,-153,0,-190,0,231,

%T 253,-276,0,0,351,0,0,-435,-465,-496,0,561,595,630,0,-703,741,780,0,

%U -861,-903,-946,0,0,1081,-1128,0,0,0,1326,0,-1431,0,1540,0,1653,1711,-1770

%N a(n) = mu(n) * A000217(n).

%C Row sums of A127510.

%e a(n) = -15 = (-1) * 15, since mu(5) = -1 and T(5) = 15.

%t Table[MoebiusMu[n]*n*(n+1)/2, {n, 1 ,60}] (* _Amiram Eldar_, Feb 26 2020 *)

%Y Cf. A008683, A000217, A127510.

%K sign,easy

%O 1,2

%A _Gary W. Adamson_, Jan 17 2007

%E More terms from _Amiram Eldar_, Feb 26 2020