Partition function coefficients for square lattice spin 1 Ising model.

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =0a(6) =0a(7) =2a(8) =-1a(9) =0a(10) =10a(11) =-14a(12) =13a(13) =30a(14) =-85a(15) =124a(16) =50a(17) =-476a(18) =1047a(19) =-642a(20) =-1949a(21) =7220a(22) =-9547a(23) =-2690a(24) =42625a(25) =-90224a(26) =62414a(27) =190074a(28) =-683506a(29) =952260