The growth series for the affine Weyl group E_7.

Terms

a(0) =1a(1) =8a(2) =35a(3) =112a(4) =294a(5) =673a(6) =1393a(7) =2668a(8) =4803a(9) =8218a(10) =13476a(11) =21315a(12) =32684a(13) =48782a(14) =71101a(15) =101473a(16) =142121a(17) =195714a(18) =265426a(19) =354999a(20) =468809a(21) =611936a(22) =790238a(23) =1010430a(24) =1280166a(25) =1608124a(26) =2004094a(27) =2479071a(28) =3045353a(29) =3716642