This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A054604 #21 Jul 09 2025 10:42:49
%S A054604 0,5,40,255,1040,3145,7800,16835,32800,59085,100040,161095,248880,
%T A054604 371345,537880,759435,1048640,1419925,1889640,2476175,3200080,4084185,
%U A054604 5153720,6436435,7962720,9765725,11881480,14349015,17210480,20511265
%N A054604 a(n) = Sum_{d|5} phi(d)*n^(5/d).
%H A054604 Seiichi Manyama, <a href="/A054604/b054604.txt">Table of n, a(n) for n = 0..10000</a>
%H A054604 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (6,-15,20,-15,6,-1).
%F A054604 a(n) = n^5 + 4n.
%F A054604 G.f.: 5*x*(x^4+2*x^3+18*x^2+2*x+1)/(x-1)^6. [_Colin Barker_, Dec 21 2012]
%t A054604 Table[n^5+4n,{n,0,30}] (* or *) LinearRecurrence[{6,-15,20,-15,6,-1},{0,5,40,255,1040,3145},30] (* _Harvey P. Dale_, Jul 09 2025 *)
%Y A054604 Row n=5 of A185651.
%K A054604 nonn,easy
%O A054604 0,2
%A A054604 _N. J. A. Sloane_, Apr 16 2000