4,2
M. B. Dillencourt, personal communication.
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: A074141 A122931 A094976 this_sequence A099626 A046672 A046866
Adjacent sequences: A006866 A006867 A006868 this_sequence A006870 A006871 A006872
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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