A131529 Number of permutations of {1,2,...n} for which differences of adjacent numbers are all distinct.

1, 2, 4, 12, 44, 176, 788, 3936, 23264, 152112, 1104876, 8725320, 74715908, 687915040, 6782261964, 71294227456, 796138700016, 9409401651840, 117378774461812

Offset: 1

Author

Vladeta Jovovic, Aug 26 2007

Keywords

• more
• nonn

Links

• Joerg Arndt, lexicopraphically first permutation with distinct differences for n=1..30 (permutations of {0,1,2,..,n-1}, i.e., zero based).

Crossrefs

Cf. A040018, A091217, A006967.

Extensions

2 more terms from R. J. Mathar, Oct 25 2007

7 more terms from R. H. Hardin, Nov 26 2009