Theta series of A_11 lattice.

Terms

a(0) =1a(1) =132a(2) =2970a(3) =19800a(4) =66462a(5) =194832a(6) =420684a(7) =881760a(8) =1511730a(9) =2770284a(10) =4134240a(11) =6754968a(12) =9491130a(13) =14310120a(14) =18773964a(15) =27609648a(16) =34253142a(17) =47864520a(18) =58862870a(19) =78974808a(20) =93470652a(21) =125490024a(22) =143483340a(23) =186539760a(24) =214957644a(25) =271553700a(26) =304365600