4,3
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: A159650 A092181 A001702 * A008663 A125334 A126492
Adjacent sequences: A004305 A004306 A004307 * A004309 A004310 A004311
nonn
N. J. A. Sloane (njas(AT)research.att.com).
