A147741 Number of permutations of 2..n+1 with all sums of 2 through 2 adjacent terms squared respectively unique.

1, 2, 6, 24, 120, 720, 5040, 37440, 342720, 3159264, 35662560, 423017280, 5316721920, 74414502720

Offset

1,2

Links

Table of n, a(n) for n=1..14.

Crossrefs

Sequence in context: A152371 A152386 A147736 * A152379 A152377 A152382

Adjacent sequences: A147738 A147739 A147740 * A147742 A147743 A147744

Keyword

nonn

Author

R. H. Hardin, Nov 11 2008

Status

approved