A147937 Number of permutations of floor(i*7/3), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.

1, 2, 6, 24, 74, 368, 2214, 10892, 69096, 539954, 3553936, 28970266, 277928108, 2211165332, 22140514554, 252424615916

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147925 A147917 A147946 * A147928 A147920 A147947

Adjacent sequences: A147934 A147935 A147936 * A147938 A147939 A147940

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved