A147738 Number of permutations of 1..n with all sums of 2 through 4 adjacent terms squared respectively unique.

1, 2, 6, 24, 120, 720, 4824, 33912, 291784, 2859364, 29502962, 345179484, 4292682670, 58008700424

Offset

1,2

Links

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

Crossrefs

Sequence in context: A152366 A147740 A147739 * A147737 A177539 A177546

Adjacent sequences: A147735 A147736 A147737 * A147739 A147740 A147741

Keyword

nonn

Author

R. H. Hardin, Nov 11 2008

Status

approved