Theta series of A_12 lattice.

Terms

a(0) =1a(1) =156a(2) =4290a(3) =36036a(4) =141726a(5) =449592a(6) =1098812a(7) =2417844a(8) =4575714a(9) =8556132a(10) =13981110a(11) =23250084a(12) =34902582a(13) =53549496a(14) =75168522a(15) =109953272a(16) =146737890a(17) =204766848a(18) =265082246a(19) =357073860a(20) =447493332a(21) =591649344a(22) =720098808a(23) =928421208a(24) =1118340652a(25) =1408153188