Theta series of 14-dimensional unimodular lattice (E7+E7)+.

Terms

a(0) =1a(1) =0a(2) =252a(3) =3136a(4) =17388a(5) =64512a(6) =194656a(7) =501120a(8) =1101996a(9) =2193408a(10) =4195800a(11) =7551936a(12) =12508384a(13) =19934208a(14) =31616064a(15) =48487040a(16) =70404012a(17) =99735552a(18) =142513308a(19) =200515392a(20) =268608312a(21) =353783808a(22) =475911072