a(n) = 2^n - C(n,0) - C(n,1) - ... - C(n,8).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =1a(10) =11a(11) =67a(12) =299a(13) =1093a(14) =3473a(15) =9949a(16) =26333a(17) =65536a(18) =155382a(19) =354522a(20) =784626a(21) =1695222a(22) =3593934a(23) =7507638a(24) =15505590a(25) =31746651a(26) =64574877a(27) =130712029a(28) =263644133a(29) =530396371