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%I #7 Jul 07 2015 18:16:06
%S 4,32,164,704,2748,10096,35524,121056,402420,1311504,4205476,13304864,
%T 41612324,128878736,395767092,1206315296,3652739252,10995977424,
%U 32927997988,98139646880,291246749300,860965104720
%N Guttmann's coefficients c_n rho_n for square lattice.
%H A. J. Guttmann, <a href="http://dx.doi.org/10.1088/0305-4470/18/4/009">Lattice trails II: numerical results</a>, J. Phys. A 22 (1989), 575-588.
%K nonn,more
%O 1,1
%A _N. J. A. Sloane_, Jul 07 2015