login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A324366 Number of permutations p of [n] having at least one index i with |p(i)-i| = 3. 3

%I #8 Feb 24 2019 15:30:17

%S 0,0,0,0,10,67,455,3486,29296,272064,2782768,31112974,377989835,

%T 4961822943,70010940186,1056948399594,17002714972374,290376470114307,

%U 5247488148645251,100046090532522600,2006982109206921472,42259647960510173184,931935465775791556864

%N Number of permutations p of [n] having at least one index i with |p(i)-i| = 3.

%H Alois P. Heinz, <a href="/A324366/b324366.txt">Table of n, a(n) for n = 0..250</a>

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Permutation">Permutation</a>

%F a(n) = n! - A324365(n).

%e a(4) = 10: 2341, 2431, 3241, 3421, 4123, 4132, 4213, 4231, 4312, 4321.

%Y Column k=3 of A306506.

%Y Cf. A000142, A324365.

%K nonn

%O 0,5

%A _Alois P. Heinz_, Feb 23 2019

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 19 03:30 EDT 2024. Contains 371782 sequences. (Running on oeis4.)