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%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
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