A147924 Number of permutations of floor(i*9/7), i=0..n-1, with all sums of two adjacent terms unique.

1, 2, 6, 16, 74, 304, 1720, 11448, 73544, 556452, 4351440, 39758684, 380173176, 3837917536, 45346283462, 532159158036

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147942 A147933 A147886 * A147908 A147900 A147892

Adjacent sequences: A147921 A147922 A147923 * A147925 A147926 A147927

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved