Low-temperature partition function expansion for square lattice (Potts model, q=4).

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =3a(5) =0a(6) =6a(7) =12a(8) =3a(9) =72a(10) =66a(11) =144a(12) =822a(13) =480a(14) =3624a(15) =8508a(16) =10482a(17) =65856a(18) =94794a(19) =289452a(20) =1008420a(21) =1561032a(22) =6503532a(23) =15224016a(24) =34976979a(25) =125988144a(26) =263308986a(27) =805096764a(28) =2319752694a(29) =5402283396