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A054603 a(n) = Sum_{d|4} phi(d)*n^(4/d). 1
0, 4, 24, 96, 280, 660, 1344, 2464, 4176, 6660, 10120, 14784, 20904, 28756, 38640, 50880, 65824, 83844, 105336, 130720, 160440, 194964, 234784, 280416, 332400, 391300, 457704, 532224, 615496, 708180, 810960, 924544, 1049664 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..32.

Index entries for linear recurrences with constant coefficients, signature (5,-10,10,-5,1).

FORMULA

a(n) = n^4+n^2+2n.

G.f.: -4*x*(4*x^2+x+1)/(x-1)^5. [Colin Barker, Dec 21 2012]

MATHEMATICA

LinearRecurrence[{5, -10, 10, -5, 1}, {0, 4, 24, 96, 280}, 40] (* Harvey P. Dale, Nov 29 2015 *)

CROSSREFS

Row n=4 of A185651.

Sequence in context: A259814 A009769 A119878 * A100381 A319793 A091143

Adjacent sequences:  A054600 A054601 A054602 * A054604 A054605 A054606

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Apr 16 2000

STATUS

approved

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Last modified October 23 22:56 EDT 2019. Contains 328378 sequences. (Running on oeis4.)