A147742 Number of permutations of 2..n+1 with all sums of 2 through 3 adjacent terms squared respectively unique.

1, 2, 6, 24, 120, 720, 4608, 35104, 314876, 2945156, 32435238, 381940958, 4765565464, 65551559472

Offset

1,2

Links

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

Crossrefs

Sequence in context: A152353 A152357 A152365 * A152352 A152360 A152358

Adjacent sequences: A147739 A147740 A147741 * A147743 A147744 A147745

Keyword

nonn

Author

R. H. Hardin, Nov 11 2008

Status

approved