1,2

Edwin Clark (eclark(AT)math.usf.edu) computed the first entries.

a(n) = 2^(n*(n+1)/2) - A086899(n).

Cf. A046747, A086899, A086879, A118989.

Sequence in context: A005121 A037964 A089285 this_sequence A034663 A093581 A102557

Adjacent sequences: A086903 A086904 A086905 this_sequence A086907 A086908 A086909

nonn

Yuval Dekel (dekelyuval(AT)hotmail.com), Sep 19 2003

a(6) and a(7) from Giovanni Resta (g.resta(AT)iit.cnr.it), May 08 2006