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 A016843 #15 Apr 24 2023 02:54:03
%S A016843 2187,823543,19487171,170859375,893871739,3404825447,10460353203,
%T A016843 27512614111,64339296875,137231006679,271818611107,506623120463,
%U A016843 897410677851,1522435234375,2488651484819,3938980639167,6060711605323,9095120158391,13348388671875,19203908986159
%N A016843 a(n) = (4n+3)^7.
%H A016843 <a href="/index/Rec#order_08">Index entries for linear recurrences with constant coefficients</a>, signature (8,-28,56,-70,56,-28,8,-1).
%F A016843 a(n) = A004767(n)^7. - _Wesley Ivan Hurt_, Dec 26 2013
%F A016843 Sum_{n>=0} 1/a(n) = 127*zeta(7)/256 - 61*Pi^7/368640. - _Amiram Eldar_, Apr 24 2023
%p A016843 A016843:=n->(4*n+3)^7; seq(A016843(n), n=0..50); # _Wesley Ivan Hurt_, Dec 26 2013
%t A016843 Table[(4n+3)^7, {n, 0, 50}] (* _Wesley Ivan Hurt_, Dec 26 2013 *)
%Y A016843 Cf. A004767, A013665.
%K A016843 nonn,easy
%O A016843 0,1
%A A016843 _N. J. A. Sloane_