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 A321554 a(n) = Sum_{d|n} (-1)^(n/d+1)*d^9. 4
 1, 511, 19684, 261631, 1953126, 10058524, 40353608, 133955071, 387440173, 998047386, 2357947692, 5149944604, 10604499374, 20620693688, 38445332184, 68584996351, 118587876498, 197981928403, 322687697780, 510998308506, 794320419872, 1204911270612, 1801152661464, 2636771617564, 3814699218751 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Seiichi Manyama, Table of n, a(n) for n = 1..10000 J. W. L. Glaisher, On the representations of a number as the sum of two, four, six, eight, ten, and twelve squares, Quart. J. Math. 38 (1907), 1-62 (see p. 4 and p. 8). FORMULA G.f.: Sum_{k>=1} k^9*x^k/(1 + x^k). - Seiichi Manyama, Nov 24 2018 PROG (PARI) apply( A321554(n)=sumdiv(n, d, (-1)^(n\d-1)*d^9), [1..30]) \\ M. F. Hasler, Nov 26 2018 CROSSREFS Cf. A321543 - A321565, A321807 - A321836 for similar sequences. Sequence in context: A069094 A024007 A258810 * A321548 A160956 A022191 Adjacent sequences:  A321551 A321552 A321553 * A321555 A321556 A321557 KEYWORD nonn,mult AUTHOR N. J. A. Sloane, Nov 23 2018 STATUS approved

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Last modified December 8 14:38 EST 2019. Contains 329865 sequences. (Running on oeis4.)