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 A131206 #2 Mar 30 2012 18:39:45 %S A131206 0,0,0,0,1,30,600,11760,257040,6048000,147571200,802982400, %T A131206 105409382400,3116065075200,97103204352000,3208697597952000, %U A131206 111992720007168000 %N A131206 a(n)=(A002866(n+1) - A036691(n))/192. %C A131206 The divisor in the formula is A002866(4) = 192 %Y A131206 Cf. A002866, A036691. %K A131206 nonn %O A131206 0,6 %A A131206 _Alexander R. Povolotsky_, Oct 20 2007, Oct 28 2007