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 A224297 #5 Apr 03 2013 11:59:12 %S A224297 0,0,0,0,0,0,2,56,984,14004,177140,2083560,23374060,254007320, %T A224297 2700941710,28293706782,293369952474,3020937207142,30967869359950, %U A224297 316581042622444,3231631411510936,32971319565628464,336462340456201700 %N A224297 Number of permutations of length n containing exactly 1 occurrence of 12345 and 1 occurrence of 12354. %H A224297 B. Nakamura, <a href="http://arxiv.org/abs/1301.5080">Approaches for enumerating permutations with a prescribed number of occurrences of patterns</a>, arXiv 1301.5080, 2013. %p A224297 # Programs can be obtained from author's personal website. %Y A224297 Cf. A224295, A224296. %K A224297 nonn %O A224297 1,7 %A A224297 _Brian Nakamura_, Apr 03 2013