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 A209325 #27 Apr 04 2025 01:17:14 %S A209325 0,0,0,2,5,30,163,1172,9349,84208,842149,9266416,111220875,1446134218, %T A209325 20248984181,303774206310,4860923772369,82643503648838, %U A209325 1487703851220935,28268359232622252,565401755237435337,11874072125853230504,261241878854832755345,6008813069875360106928,144216837237680799509479,3605539586383814138649074 %N A209325 Number of permutations of [n] with a succession but no fixed points. %C A209325 A succession of a permutation p is a position i such that p(i+1)-p(i) = 1. %H A209325 Max Alekseyev, <a href="/A209325/b209325.txt">Table of n, a(n) for n = 0..30</a> %F A209325 a(n) = A000166(n) - A209322(n). %e A209325 For n=4 we have 2341, 3412, 3421, 4123 and 4312. %Y A209325 Cf. A000166, A002467, A180191, A207819, A207821, A209322, A209326. %K A209325 nonn %O A209325 0,4 %A A209325 _Jon Perry_, Jan 19 2013 %E A209325 a(11)-a(14) from _Alois P. Heinz_, Jan 20 2013 %E A209325 a(15)-a(20) from _Max Alekseyev_, Oct 17 2017 %E A209325 a(21)-a(22) from _Alois P. Heinz_, Jul 05 2021 %E A209325 Terms a(23) onward from _Max Alekseyev_, Apr 03 2025