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 A264322 #5 Nov 13 2015 20:27:32 %S A264322 1,48,1520,38452,869740,18720732,396975296,8458711900,183197270195, %T A264322 4060222577980,92457026432364,2168229942019192,52433345808131318, %U A264322 1308330112118893072,33691149632085370112,895280698879996177240,24542614402374373350957,693775997089974201665016 %N A264322 Number of permutations of [n] with exactly three (possibly overlapping) occurrences of the consecutive pattern 3412. %H A264322 Alois P. Heinz, <a href="/A264322/b264322.txt">Table of n, a(n) for n = 8..180</a> %e A264322 a(8) = 1: 78563412. %e A264322 a(9) = 48: 189674523, 289674513, 389674512, ..., 896745132, 896745231, 978563412. %Y A264322 Column k=3 of A264319. %K A264322 nonn %O A264322 8,2 %A A264322 _Alois P. Heinz_, Nov 11 2015