1,6

a(n)=A134720(n)/2.

Cf. A000931, A134720.

Sequence in context: A022112 A107019 A048133 this_sequence A029933 A128913 A093005

Adjacent sequences: A135616 A135617 A135618 this_sequence A135620 A135621 A135622

nonn

Omar E. Pol (info(AT)polprimos.com), Feb 17 2008