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A054605 a(n) = Sum_{d|6} phi(d)*n^(6/d). 1
0, 6, 84, 780, 4200, 15810, 46956, 118104, 262800, 532350, 1001220, 1773156, 2988024, 4829370, 7532700, 11394480, 16781856, 24143094, 34018740, 47053500, 64008840, 85776306, 113391564, 148049160, 191118000, 244157550, 308934756 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..26.

Index entries for linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1).

FORMULA

a(n) = n^6+n^3+2n^2+2n. - Ralf Stephan, Sep 03 2003

G.f.: -6*x*(10*x^4+49*x^3+53*x^2+7*x+1) / (x-1)^7. - Colin Barker, Dec 21 2012

CROSSREFS

Row n=6 of A185651.

Sequence in context: A288321 A155191 A211171 * A119576 A098982 A229455

Adjacent sequences:  A054602 A054603 A054604 * A054606 A054607 A054608

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Apr 16 2000

STATUS

approved

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Last modified September 16 06:21 EDT 2019. Contains 327090 sequences. (Running on oeis4.)