0,2

a(n) = 2^floor[n*log2(3)] =A000079(A056576(n)) =A000244(n)-A056577(n).

a(4)=64 since 3^4=81 and 64<=81<128.

Cf. A022921.

Sequence in context: A066792 A096195 A094014 this_sequence A100736 A099888 A046161

Adjacent sequences: A098229 A098230 A098231 this_sequence A098233 A098234 A098235

easy,nonn

Henry Bottomley (se16(AT)btinternet.com), Oct 25 2004