A177279 - OEIS

%I #6 Apr 04 2019 14:40:20

%S 1,1,2,6,24,120,720,5040,40320,282240,1764000,10118880,54888240,

%T 289147152,1510241892,7937250452,42396685874,228146155304,

%U 1228995185960,6598619633952,35220099648960

%N Number of permutations of 1..n with all adjacent differences <= 7 in absolute value.

%C a(n) = n! for n <= 8.

%K nonn

%O 0,3

%A _R. H. Hardin_, May 06 2010

%E a(20) from _Alois P. Heinz_, Apr 04 2019