1,2
J. McKay, personal communication.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Cf. A006907.
Sequence in context: A037020 A094878 A079860 * A061256 A180608 A077921
Adjacent sequences: A006905 A006906 A006907 * A006909 A006910 A006911
nonn,nice,more
Simon Plouffe, N. J. A. Sloane (njas(AT)research.att.com).