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 A202225 #6 Mar 30 2012 17:30:01 %S A202225 1,2,6,24,119,708,4914,38980,347837,3448792,37614098,447531000, %T A202225 5768428803,80071254648,1190855183414,18891654561628,318427067939961, %U A202225 5682946188447440,107057773100175102,2122947536807150960,44202783404925357767,964191633859884115696 %N A202225 Number of permutations avoiding the consecutive pattern 43521. %C A202225 a(n) is the number of permutations on [n] that avoid the consecutive pattern 43521. It is the same as the number of permutations which avoid 12534, 23145 or 54132. %H A202225 Ray Chandler, <a href="/A202225/b202225.txt">Table of n, a(n) for n = 1..40</a> %H A202225 A. Baxter, B. Nakamura, and D. Zeilberger. <a href="http://www.math.rutgers.edu/~zeilberg/mamarim/mamarimhtml/auto.html">Automatic generation of theorems and proofs on enumerating consecutive Wilf-classes</a> %Y A202225 Cf. A177523, A202213-A202236. %K A202225 nonn %O A202225 1,2 %A A202225 _Ray Chandler_, Dec 15 2011