2,2

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

J. Denes, Some combinatorial properties of transformations and their connections with the theory of graphs, J. Combin. Theory, 9 (1970), 108-116.

Cf. A086373.

Adjacent sequences: A001688 A001689 A001690 this_sequence A001692 A001693 A001694

Sequence in context: A104224 A099676 A051606 this_sequence A166846 A058421 A128876

nonn

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