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 A086207 #4 Jul 08 2018 21:29:43
%S A086207 3,435,704403,15823018515,5272966965638163,26837910294320000900115,
%T A086207 2117959516569888987677094001683,
%U A086207 2614420107255201240346554326291784252435,50761384915342243255034590495173254359633089772563,15560120110421752320376568335982564883819269596340271934585875
%N A086207 Sum of rank(M) over all n X n matrices over GF(4).
%F A086207 a(n) = Sum_{r=1..n} r*Product_{j=0..r-1} (q^n-q^j)^2/(q^r-q^j) with q=4.
%o A086207 (PARI) a(n) = {my(q=4); sum(r=1, n, r*prod(j=0, r-1, (q^n-q^j)^2/(q^r-q^j)))}
%Y A086207 Cf. A086190, A086098.
%K A086207 nonn
%O A086207 1,1
%A A086207 Yuval Dekel (dekelyuval(AT)hotmail.com), Aug 27 2003
%E A086207 a(6)-a(10) from _Andrew Howroyd_, Jul 08 2018