0,11

Permutations such that the absolute difference between adjacent elements is at least 5.

Table of n, a(n) for n=0..20.

Sequence in context: A116638 A326488 A170992 * A272244 A178575 A069580

Adjacent sequences: A179955 A179956 A179957 * A179959 A179960 A179961

nonn

R. H. Hardin, Aug 03 2010

a(0), a(19)-a(20) from Alois P. Heinz, Oct 27 2014

approved