A179959 - OEIS

%I #7 Oct 27 2014 10:15:04

%S 1,1,0,0,0,0,0,0,0,0,0,0,2,352,24440,1019616,33461568,957913824,

%T 25415753280,649347224736,16370397635328

%N Number of permutations of 1..n with no adjacent elements within 5 in value.

%K nonn

%O 0,13

%A _R. H. Hardin_, Aug 03 2010

%E a(0)-a(10), a(20) from _Alois P. Heinz_, Oct 27 2014