%I #11 Dec 07 2019 21:24:21
%S 1,2,3,11,11,121,45,355,541,3785,773,18397,3173,88881,188949,210337
%N Number of distinct values of the (n-1)st difference of permutations of 1..n.
%F a(n) = A174103(n) + A174104(n).
%e a(2)=2 because the first differences of (1,2) and (2,1) are 1 and -1.
%Y Cf. A174103, A174104.
%K nonn
%O 1,2
%A _R. H. Hardin_, Aug 20 2007
%E a(15)-a(16) from _R. H. Hardin_, Mar 07 2010
%E Edited by _Max Alekseyev_, Dec 07 2019