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!)
A284207 Eleventh column of Euler's difference table in A068106. 1

%I #8 Apr 06 2017 21:26:49

%S 0,0,0,0,0,0,0,0,0,3628800,36288000,402796800,4906137600,64988179200,

%T 929459059200,14266826784000,233845982899200,4075249496774400,

%U 75225258805132800,1465957162768492800,30071395843421184000,647624841502298284800

%N Eleventh column of Euler's difference table in A068106.

%C For n >= 11, this is the number of permutations of [n] that avoid substrings j(j+10), 1 <= j <= n-10.

%H Enrique Navarrete, <a href="http://arxiv.org/abs/1610.06217">Generalized K-Shift Forbidden Substrings in Permutations</a>, arXiv:1610.06217 [math.CO], 2016.

%F For n>=11: a(n) = Sum_{j=0..n-10} (-1)^j*binomial(n-10,j)*(n-j)!.

%F Note a(n)/n! ~ 1/e.

%e a(14)=64988179200 since this is the number of permutations in S14 that avoid substrings {1(11),2(12),3(13),4(14)}.

%t Table[Sum[(-1)^j*Binomial[n - 10, j]*(n - j)!, {j, 0, n - 10}], {n, 22}] (* _Michael De Vlieger_, Apr 03 2017 *)

%Y Also 3628800 times A176736.

%Y Cf. A068106.

%K nonn

%O 1,10

%A _Enrique Navarrete_, Mar 22 2017

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 24 00:30 EDT 2024. Contains 371917 sequences. (Running on oeis4.)