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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Table of n, a(n) for n=1..55.
R. K. Guy, Letter to N. J. A. Sloane with attachment, 1982
Sequence in context: A219635 A063225 A213238 * A086813 A287081 A294482
Adjacent sequences: A005657 A005658 A005659 * A005661 A005662 A005663
N. J. A. Sloane
More terms from Larry Reeves (larryr(AT)acm.org), Oct 01 2001