1,2
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Earl Glen Whitehead, Jr., Four-discordant permutations, J. Austral. Math. Soc. Ser. A 28 (1979), no. 3, 369-377.
Sequence in context: A121584 A059227 A081103 * A180567 A152392 A001563
Adjacent sequences: A005774 A005775 A005776 * A005778 A005779 A005780
nonn
N. J. A. Sloane (njas(AT)research.att.com).
