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A125287
a(n) = mu(n) * A000217(n).
1
1, -3, -6, 0, -15, 21, -28, 0, 0, 55, -66, 0, -91, 105, 120, 0, -153, 0, -190, 0, 231, 253, -276, 0, 0, 351, 0, 0, -435, -465, -496, 0, 561, 595, 630, 0, -703, 741, 780, 0, -861, -903, -946, 0, 0, 1081, -1128, 0, 0, 0, 1326, 0, -1431, 0, 1540, 0, 1653, 1711, -1770
OFFSET
1,2
COMMENTS
Row sums of A127510.
EXAMPLE
a(n) = -15 = (-1) * 15, since mu(5) = -1 and T(5) = 15.
MATHEMATICA
Table[MoebiusMu[n]*n*(n+1)/2, {n, 1 , 60}] (* Amiram Eldar, Feb 26 2020 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Gary W. Adamson, Jan 17 2007
EXTENSIONS
More terms from Amiram Eldar, Feb 26 2020
STATUS
approved