A147941 Number of permutations of floor(i*9/4), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.

1, 2, 6, 16, 96, 376, 1924, 10496, 84546, 522100, 3532332, 28645680, 292372132, 2430262092, 21376627926, 227599952694

Offset

1,2

Links

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

Crossrefs

Sequence in context: A204436 A135068 A147950 * A147932 A147923 A341838

Adjacent sequences: A147938 A147939 A147940 * A147942 A147943 A147944

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved