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 A032108 #7 Mar 30 2012 17:37:01 %S A032108 3,9,81,972,14580,262440,5511240,132269760,3571283520,107138505600, %T A032108 3535570684800,127280544652800,4963941241459200,208485532141286400, %U A032108 9381848946357888000,450328749425178624000 %N A032108 Number of reversible strings with n labeled beads of 3 colors. %H A032108 C. G. Bower, <a href="/transforms2.html">Transforms (2)</a> %F A032108 "BIJ" (reversible, indistinct, labeled) transform of 3, 0, 0, 0... %F A032108 3^n*n!/2 (n>1). E.g.f.: (2-9*x^2)/(2-6*x). %K A032108 nonn %O A032108 1,1 %A A032108 _Christian G. Bower_