a(n) = 2^n - C(n,0) - C(n,1) - ... - C(n,7).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =1a(9) =10a(10) =56a(11) =232a(12) =794a(13) =2380a(14) =6476a(15) =16384a(16) =39203a(17) =89846a(18) =199140a(19) =430104a(20) =910596a(21) =1898712a(22) =3913704a(23) =7997952a(24) =16241061a(25) =32828226a(26) =66137152a(27) =132932104a(28) =266752238a(29) =534688516