Glaisher's function G(n) (18 squares version).

Terms

a(0) =1a(1) =-20a(2) =-80a(3) =144a(4) =610a(5) =-448a(6) =-1120a(7) =2240a(8) =-3423a(9) =-12200a(10) =14800a(11) =29440a(12) =-5470a(13) =-6272a(14) =-48800a(15) =-81664a(16) =73090a(17) =68460a(18) =15600a(19) =87840a(20) =-139776a(21) =82880a(22) =189920a(23) =-474112a(24) =-18525a(25) =109400a(26) =-251040a(27) =412160a(28) =-128222a(29) =-273280