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 A085404 #3 Mar 31 2012 13:20:48 %S A085404 1,75,79380,1310904000,344319762124800,1444887697908695040000, %T A085404 96976611786040182520676352000, %U A085404 104131021972308383324202529613414400000,1788970984376098024967914354100894418012733440000 %N A085404 Number of n X n matrices over GF(4) with rank n-1. %F A085404 For n>=2: a(n) = product j=0...n-2 (4^n - 4^j)^2 / (4^(n-1)- 4^j). %Y A085404 Cf. A086752, A053291, A060869. %K A085404 nonn,easy %O A085404 1,2 %A A085404 Yuval Dekel (dekelyuval(AT)hotmail.com), Jul 31 2003 %E A085404 More terms from _David Wasserman_, Jan 31 2005