Number of points of L1 norm 2n in Hamming code version of E_8 lattice.

Terms

a(0) =1a(1) =16a(2) =352a(3) =3376a(4) =19648a(5) =82256a(6) =273440a(7) =767600a(8) =1894784a(9) =4228752a(10) =8703712a(11) =16763824a(12) =30549568a(13) =53125072a(14) =88750496a(15) =143203568a(16) =224154368a(17) =341597456a(18) =508345440a(19) =740588080a(20) =1058521024a(21) =1487048272