1,2

a(n) = 2^(A000040(n)-2) = 2^(A040976(n)) = 2^A000040(n)/4 = A061286(n)/2.

Cf. A000040, A040976, A061286.

Adjacent sequences: A135617 A135618 A135619 this_sequence A135621 A135622 A135623

Sequence in context: A063505 A085466 A084039 this_sequence A134708 A037513 A037716

easy,nonn

Omar E. Pol (info(AT)polprimos.com), Mar 01 2008