login
Number of permutations of 1..n with i-9<=p(i)<=i+4
1

%I #4 Mar 31 2012 12:35:45

%S 1,2,6,24,120,600,3000,15000,75000,375000,1776696,8208474,37712866,

%T 174397531,817232461,3852954960,18199500712,85943742360,405446385984,

%U 1911059547264,9001323581376,42375227446272,199427319607104

%N Number of permutations of 1..n with i-9<=p(i)<=i+4

%H R. H. Hardin, <a href="/A179357/b179357.txt">Table of n, a(n) for n=1..400</a>

%K nonn

%O 1,2

%A _R. H. Hardin_ Jul 11 2010