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 A224180 #13 Jan 02 2019 16:15:25 %S A224180 0,0,0,0,1,19,246,2767,29384,305646,3170684,33104118,349462727, %T A224180 3738073247,40549242195,446115153023,4976319258200,56252653681606, %U A224180 643996994735079,7461850038335967,87447167319345337,1035866799853591309,12395264890256322913 %N A224180 Number of permutations of length n containing exactly 1 occurrence of 12354. %H A224180 Brian Nakamura, <a href="http://puma.dimai.unifi.it/24_2/nakamura.pdf">Approaches for enumerating permutations with a prescribed number of occurrences of patterns</a>, PU. M. A. 24 (2013), 179-194 %H A224180 Brian 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 A224180 Programs can be obtained from the link. %Y A224180 Cf. A047889. %K A224180 nonn %O A224180 1,6 %A A224180 _Brian Nakamura_, Apr 01 2013