a(n) = Sum_{k=0..13} binomial(n, k).

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =32a(6) =64a(7) =128a(8) =256a(9) =512a(10) =1024a(11) =2048a(12) =4096a(13) =8192a(14) =16383a(15) =32752a(16) =65399a(17) =130238a(18) =258096a(19) =507624a(20) =988116a(21) =1898712a(22) =3593934a(23) =6690448a(24) =12236830a(25) =21977516a(26) =38754732a(27) =67108864a(28) =114159428a(29) =190876696