A147893 Number of permutations of floor(i*5/4), i=0..n-1, with all sums of two and three adjacent terms respectively unique.

1, 2, 6, 16, 74, 304, 1424, 6922, 40922, 250670, 1645304, 11152882, 92183062, 780194356, 6842821428, 61855909454

Offset

1,2

Links

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

Crossrefs

Sequence in context: A114249 A147910 A147902 * A147951 A147942 A147933

Adjacent sequences: A147890 A147891 A147892 * A147894 A147895 A147896

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved