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 A246250 #10 Aug 26 2014 17:02:55 %S A246250 1620265923,142031290158,8039798211078,366995453376294, %T A246250 14827018289073804,555488440936519572,19848769453749875607, %U A246250 688735406876831016606,23495176763112174568146,794853120296757717355104,26836227616917587293450368,908479209956520414451380624 %N A246250 Number of permutations of [n] with exactly five occurrences of the consecutive step pattern up, down, down. %H A246250 Alois P. Heinz, <a href="/A246250/b246250.txt">Table of n, a(n) for n = 16..160</a> %F A246250 a(n) ~ c * (3*sqrt(3)/(2*Pi))^n * n! * n^5, where c = 0.00005687732922585807984... = c0 * (c0-1)^5 / (3^5 * 5!), and c0 = (1 + exp(Pi/sqrt(3))) * sqrt(3) / (2*Pi). - _Vaclav Kotesovec_, Aug 26 2014 %Y A246250 Column k=5 of A242819. %K A246250 nonn %O A246250 16,1 %A A246250 _Alois P. Heinz_, Aug 20 2014