A130803 Number of distinct values of the (n-1)st difference of permutations of 1..n.

1, 2, 3, 11, 11, 121, 45, 355, 541, 3785, 773, 18397, 3173, 88881, 188949, 210337

Offset

1,2

Links

Table of n, a(n) for n=1..16.

Formula

a(n) = A174103(n) + A174104(n).

Example

a(2)=2 because the first differences of (1,2) and (2,1) are 1 and -1.

Crossrefs

Cf. A174103, A174104.

Sequence in context: A335173 A265563 A265547 * A007932 A334054 A035122

Adjacent sequences: A130800 A130801 A130802 * A130804 A130805 A130806

Keyword

nonn

Author

R. H. Hardin, Aug 20 2007

Extensions

a(15)-a(16) from R. H. Hardin, Mar 07 2010

Edited by Max Alekseyev, Dec 07 2019

Status

approved