1,2

For length 3 see a(3) which gives 2^17 = {131}072.

Cf. A052058, A052057.

Sequence in context: A101196 A064637 A115942 this_sequence A041526 A041524 A042205

Adjacent sequences: A052056 A052057 A052058 this_sequence A052060 A052061 A052062

nonn,base,hard

Patrick De Geest (pdg(AT)worldofnumbers.com), Jan 15 2000.

1445 from Erich Friedman (efriedma(AT)stetson.edu), Feb 19 2000, who reports next term >3000.