High temperature series for spin-1/2 Ising magnetic susceptibility on 2D square lattice.

Terms

a(0) =1a(1) =4a(2) =12a(3) =36a(4) =100a(5) =276a(6) =740a(7) =1972a(8) =5172a(9) =13492a(10) =34876a(11) =89764a(12) =229628a(13) =585508a(14) =1486308a(15) =3763460a(16) =9497380a(17) =23918708a(18) =60080156a(19) =150660388a(20) =377009364a(21) =942106116a(22) =2350157268a(23) =5855734740a(24) =14569318492a(25) =36212402548a(26) =89896870204