1,2
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Sequence in context: A024504 A088172 A048573 this_sequence A074129 A055003 A099361
Adjacent sequences: A006943 A006944 A006945 this_sequence A006947 A006948 A006949
nonn,more
N. J. A. Sloane (njas(AT)research.att.com), Herb Taylor
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