OFFSET
2,1
COMMENTS
a(4)=a(8)=a(16)=0 because when n>2 is a power of a prime p, the (n-1)-st difference of any permutation of 1..n is a multiple of p.
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 07 2010, comment from M. F. Hasler and Max Alekseyev, on the Sequence Fans Mailing List
STATUS
approved