1,1
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
P. G. Watson, in C. Domb and M. S. Green, Phase Transitions and Critical Phenomena, Ac. Press 1972, Vol. 2, p. 136.
Sequence in context: A203605 A094254 A093647 * A003481 A081006 A000183
Adjacent sequences: A003487 A003488 A003489 * A003491 A003492 A003493
nonn
N. J. A. Sloane (njas(AT)research.att.com).
Better description from S. R. Finch (Steven.Finch(AT)inria.fr)