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 A276131 #12 May 18 2024 15:56:42
%S A276131 1,1,1,1,1,10,136,20251,413100001,170660037240000001,
%T A276131 2912484838126132813026335712191641,
%U A276131 62371823031725048177115183368983888882661870237372850050710016335
%N A276131 a(n) = (a(n-1)^2+a(n-2)^2+a(n-3)^2+a(n-4)^2+a(n-1)*a(n-2)+a(n-1)*a(n-3)+a(n-1)*a(n-4)+a(n-2)*a(n-3)+a(n-2)*a(n-4)+a(n-3)*a(n-4))/a(n-5) with five initial ones.
%H A276131 Seiichi Manyama, <a href="/A276131/b276131.txt">Table of n, a(n) for n = 0..15</a>
%F A276131 a(n) = 15*a(n-1)*a(n-2)*a(n-3)*a(n-4)-a(n-1)-a(n-2)-a(n-3)-a(n-4)-a(n-5).
%t A276131 nxt[{a_,b_,c_,d_,e_}]:={b,c,d,e,15(b*c*d*e)-a-b-c-d-e}; NestList[nxt,{1,1,1,1,1},15][[;;,1]] (* _Harvey P. Dale_, May 18 2024 *)
%Y A276131 Cf. A165903, A165896.
%K A276131 nonn
%O A276131 0,6
%A A276131 _Seiichi Manyama_, Aug 21 2016