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 A202233 #6 Mar 30 2012 17:30:04 %S A202233 1,2,6,24,119,708,4915,38992,347980,3450572,37637545,447857256, %T A202233 5773243451,80146549212,1192100892680,18913413488544,318827489139059, %U A202233 5690693361661052,107215038571876213,2126290615269312536,44277066284532913066,965913951460006237612 %N A202233 Number of permutations avoiding the consecutive pattern 45231. %C A202233 a(n) is the number of permutations on [n] that avoid the consecutive pattern 45231. It is the same as the number of permutations which avoid 13254, 21435 or 53412. %H A202233 Ray Chandler, <a href="/A202233/b202233.txt">Table of n, a(n) for n = 1..40</a> %H A202233 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 A202233 Cf. A177523, A202213-A202236. %K A202233 nonn %O A202233 1,2 %A A202233 _Ray Chandler_, Dec 15 2011