0,5
P. D. Lincoln, personal communication.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Cf. A006982, A006966.
Sequence in context: A088325 A006210 A096812 * A003427 A045648 A166354
Adjacent sequences: A006978 A006979 A006980 * A006982 A006983 A006984
nonn
N. J. A. Sloane (njas(AT)research.att.com).