A147938 Number of permutations of floor(i*7/5), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.

1, 2, 6, 24, 74, 372, 1764, 9076, 51988, 292392, 2059488, 14021462, 105081158, 851532252, 6805717470, 64732937542

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147928 A147920 A147947 * A147929 A147921 A263712

Adjacent sequences: A147935 A147936 A147937 * A147939 A147940 A147941

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved