A147915 Number of permutations of floor(i*9/5), i=0..n-1, with all sums of 2 through 5 adjacent terms respectively unique.

1, 2, 6, 24, 96, 444, 2508, 13216, 74772, 490758, 3432594, 29784866, 218746780, 1711675050, 14763495624, 145575514096

Offset

1,2

Links

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

Crossrefs

Sequence in context: A084509 A334767 A323260 * A147906 A147898 A147890

Adjacent sequences: A147912 A147913 A147914 * A147916 A147917 A147918

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved