1,2
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Cf. A030222.
Sequence in context: A026966 A026976 A026951 * A003499 A018953 A009199
Adjacent sequences: A030230 A030231 A030232 * A030234 A030235 A030236
nonn,hard
David W. Wilson (davidwwilson(AT)comcast.net)
More terms from Joseph Myers (jsm(AT)polyomino.org.uk), Sep 26 2002