A147895 Number of permutations of floor(i*7/4), i=0..n-1, with all sums of two and three adjacent terms respectively unique.

1, 2, 6, 24, 96, 456, 2134, 12418, 81178, 625138, 4275412, 32681806, 305356674, 3193552544, 29875677830, 301075498104

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147890 A147912 A147903 * A070945 A152320 A267384

Adjacent sequences: A147892 A147893 A147894 * A147896 A147897 A147898

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved