1,2

286 is a term as 286 = 2*11*13 is square-free

and 286 = (13*12*11)/(1*2*3) = Binomial(13,3).

Cf. A005117, A061304, A000292.

Sequence in context: A052472 A049736 A048507 this_sequence A126995 A000820 A126249

Adjacent sequences: A070752 A070753 A070754 this_sequence A070756 A070757 A070758

nonn

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 14 2002