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 A246255 #10 Aug 26 2014 17:07:12 %S A246255 62671742039942099631403299,18231157381733294406542318214, %T A246255 3087040831300287487055787449994,394974982016287093640971012693311, %U A246255 42334746925643499979072751981842422,4013581941216432516413056735995683706,347925850343780865770905714211197525182 %N A246255 Number of permutations of [n] with exactly ten occurrences of the consecutive step pattern up, down, down. %H A246255 Alois P. Heinz, <a href="/A246255/b246255.txt">Table of n, a(n) for n = 31..160</a> %F A246255 a(n) ~ c * (3*sqrt(3)/(2*Pi))^n * n! * n^10, where c = 0.00000000000652802483581788974... = c0 * (c0-1)^10 / (3^10 * 10!), and c0 = (1 + exp(Pi/sqrt(3))) * sqrt(3) / (2*Pi). - _Vaclav Kotesovec_, Aug 26 2014 %Y A246255 Column k=10 of A242819. %K A246255 nonn %O A246255 31,1 %A A246255 _Alois P. Heinz_, Aug 20 2014