A147928 Number of permutations of floor(i*7/3), i=0..n-1, with all sums of two and three adjacent terms respectively unique.

1, 2, 6, 24, 74, 368, 2214, 10892, 70136, 578748, 3920958, 33396960, 341266768, 2847640070, 30294332328, 372805397466

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147917 A147946 A147937 * A147920 A147947 A147938

Adjacent sequences: A147925 A147926 A147927 * A147929 A147930 A147931

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved