Series expansion for mean-squared radius of gyration of rectangles on square lattice.

Terms

a(0) =0a(1) =8a(2) =66a(3) =288a(4) =900a(5) =2280a(6) =4998a(7) =9856a(8) =17928a(9) =30600a(10) =49610a(11) =77088a(12) =115596a(13) =168168a(14) =238350a(15) =330240a(16) =448528a(17) =598536a(18) =786258a(19) =1018400a(20) =1302420a(21) =1646568a(22) =2059926a(23) =2552448a(24) =3135000a(25) =3819400a(26) =4618458a(27) =5546016a(28) =6616988a(29) =7847400