A147932 Number of permutations of floor(i*9/4), i=0..n-1, with all sums of two and three adjacent terms respectively unique.

1, 2, 6, 16, 96, 376, 1924, 10912, 90032, 563836, 3920958, 33396960, 370390258, 3235719046, 30075123118, 343158668698

Offset

1,2

Links

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

Crossrefs

Sequence in context: A135068 A147950 A147941 * A147923 A341838 A325790

Adjacent sequences: A147929 A147930 A147931 * A147933 A147934 A147935

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved