A147731 Number of permutations of 0..n-1 with all sums of 2 through 2 adjacent terms squared respectively unique.

1, 2, 6, 24, 120, 624, 4560, 37440, 323520, 3167616, 34387248, 397398720, 5179836888, 69488212320, 1032953884956

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Crossrefs

Sequence in context: A147734 A147733 A147732 * A152337 A152338 A152348

Adjacent sequences: A147728 A147729 A147730 * A147732 A147733 A147734

Keyword

nonn

Author

R. H. Hardin, Nov 11 2008

Status

approved