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 A054608 a(n) = Sum_{d|9} phi(d)*n^(9/d). 2
 0, 9, 540, 19755, 262296, 1953405, 10078164, 40354335, 134218800, 387422001, 1000002060, 2357950419, 5159783880, 10604503845, 20661052356, 38443366215, 68719485024, 118587886425, 198359302140, 322687711611, 512000016120 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..10000 Index entries for linear recurrences with constant coefficients, signature (10,-45,120,-210,252,-210,120,-45,10,-1). FORMULA G.f.: 9*x*(x^8 + 50*x^7 + 1640*x^6 + 9774*x^5 + 17390*x^4 + 9774*x^3 + 1640*x^2 + 50*x + 1) / (x - 1)^10. - Colin Barker, Dec 21 2012 a(n) = n^9 + 2*n^3 + 6*n. - Seiichi Manyama, Jul 11 2021 PROG (PARI) a(n) = n^9+2*n^3+6*n; \\ Seiichi Manyama, Jul 11 2021 CROSSREFS Row n=9 of A185651. Sequence in context: A015508 A281800 A266889 * A269661 A287043 A317347 Adjacent sequences:  A054605 A054606 A054607 * A054609 A054610 A054611 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, Apr 16 2000 STATUS approved

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Last modified August 16 05:38 EDT 2022. Contains 356162 sequences. (Running on oeis4.)