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 A083200 #22 Aug 18 2025 23:36:54
%S A083200 0,1,17,118,514,1681,4529,10612,22380,43473,79057,136202,224302,
%T A083200 355537,545377,813128,1182520,1682337,2347089,3217726,4342394,5777233,
%U A083200 7587217,9847036,12642020,16069105,20237841,25271442,31307878,38501009,47021761,57059344,68822512
%N A083200 Polynexus numbers of order 7.
%H A083200 Bruno Berselli, <a href="/A083200/b083200.txt">Table of n, a(n) for n = 1..1000</a>
%H A083200 <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (7,-21,35,-35,21,-7,1).
%F A083200 a(n) = ((n^7-(n-1)^7)-(n^3-(n-1)^3))/120.
%F A083200 G.f.: x^2*(1+10*x+20*x^2+10*x^3+x^4)/(1-x)^7. - _Bruno Berselli_, Feb 13 2012
%t A083200 Table[((n^7 - (n - 1)^7) - (n^3 - (n - 1)^3))/120, {n, 31}] (* _Bruno Berselli_, Feb 13 2012 *)
%Y A083200 Cf. A079547, A088889-A088894 (similar sequences).
%K A083200 nonn,easy
%O A083200 1,3
%A A083200 Xavier Acloque, Jun 01 2003
%E A083200 More terms from _David Wasserman_, Oct 26 2004
%E A083200 Offset changed (according to the formula) from _Bruno Berselli_, Feb 13 2012