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 this_sequence A152392 A001563 A094304

Adjacent sequences: A005774 A005775 A005776 this_sequence A005778 A005779 A005780

nonn

N. J. A. Sloane (njas(AT)research.att.com).