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A054605 a(n) = Sum_{d|6} phi(d)*n^(6/d). 1

%I

%S 0,6,84,780,4200,15810,46956,118104,262800,532350,1001220,1773156,

%T 2988024,4829370,7532700,11394480,16781856,24143094,34018740,47053500,

%U 64008840,85776306,113391564,148049160,191118000,244157550,308934756

%N a(n) = Sum_{d|6} phi(d)*n^(6/d).

%H <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (7,-21,35,-35,21,-7,1).

%F a(n) = n^6+n^3+2n^2+2n. - _Ralf Stephan_, Sep 03 2003

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

%Y Row n=6 of A185651.

%K nonn,easy

%O 0,2

%A _N. J. A. Sloane_, Apr 16 2000

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Last modified October 17 11:26 EDT 2019. Contains 328108 sequences. (Running on oeis4.)