A147899 Number of permutations of floor(i*9/8), i=0..n-1, with all sums of two and three adjacent terms respectively unique.

1, 2, 6, 16, 54, 232, 936, 4136, 25518, 153608, 989110, 6834648, 49015240, 365663988, 2898743824, 24274925344

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147916 A147907 A147634 * A147949 A147940 A147931

Adjacent sequences: A147896 A147897 A147898 * A147900 A147901 A147902

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved