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A038068 Product_{k>=1}(1 + x^k)^a(k) = 1 + 3x. 7
3, -3, 8, -21, 48, -116, 312, -831, 2184, -5880, 16104, -44336, 122640, -341484, 956576, -2690841, 7596480, -21522228, 61171656, -174342144, 498111952, -1426403748, 4093181688, -11767919276, 33891544368, -97764009000 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
N. J. A. Sloane, Weigh transform
FORMULA
Dirichlet convolution of A038064 with characteristic function of powers of 2.
a(n) = 1/n*(-(-3)^n + Sum_{d<n and d|n} (-1)^(n/d)*d*a(d)). - Seiichi Manyama, Jun 23 2018
CROSSREFS
Sequence in context: A027376 A190659 A202536 * A267952 A221773 A101126
KEYWORD
sign
AUTHOR
Christian G. Bower, Jan 04 1999
STATUS
approved

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Last modified June 22 08:10 EDT 2024. Contains 373566 sequences. (Running on oeis4.)