1,1
R. V. Ditzian and L. P. Kadanoff, Series studies of the four-state Potts model, J. Phys. A 12 (1979), L229-L233.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Sequence in context: A124408 A136779 A106328 * A025595 A151331 A137962
Adjacent sequences: A007274 A007275 A007276 * A007278 A007279 A007280
nonn
Simon Plouffe (simon.plouffe(AT)gmail.com)