0,2

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

H. Taylor, personal communication.

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

Cf. A048289.

Sequence in context: A155019 A020539 A157442 this_sequence A098253 A031517 A116285

Adjacent sequences: A007562 A007563 A007564 this_sequence A007566 A007567 A007568

nonn,fini,nice,hard

N. J. A. Sloane (njas(AT)research.att.com).

2 more terms from Arlin Anderson (starship1(AT)gmail.com)