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 A264320 #6 Nov 11 2015 19:17:51 %S A264320 1,10,88,794,7639,79164,885128,10657588,137752283,1904555934, %T A264320 28068929900,439495830750,7288494061255,127654030808304, %U A264320 2355066281798588,45655570757683888,927984709909530539,19735811069218548106,438344811235148801632,10149979837759608190794 %N A264320 Number of permutations of [n] with exactly one occurrence of the consecutive pattern 3412. %H A264320 Alois P. Heinz, <a href="/A264320/b264320.txt">Table of n, a(n) for n = 4..200</a> %e A264320 a(4) = 1: 3412. %e A264320 a(5) = 10: 14523, 24513, 34125, 34512, 35124, 43512, 45123, 45132, 45231, 53412. %Y A264320 Column k=1 of A264319. %K A264320 nonn %O A264320 4,2 %A A264320 _Alois P. Heinz_, Nov 11 2015