4,1
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).
Table of n, a(n) for n=4..11.
Sequence in context: A088490 A195321 A069058 * A052619 A110753 A174085
Adjacent sequences: A007273 A007274 A007275 * A007277 A007278 A007279
nonn
Simon Plouffe
approved
