|
%I #5 Mar 02 2016 11:23:56
%S 1,1,12870,9465511770,99561092450391000,151158246783053570131500,
%T 91756879673807945288868127380
%N Number of permutations of 8 copies of 1..n with all adjacent differences <= 3 in absolute value.
%C a(n) = (8n)!/40320^n for n<=4.
%Y Cf. A172609.
%K nonn
%O 0,3
%A _R. H. Hardin_, May 06 2010
| 