a(n) = Sum_{k=0..11} C(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) =4095a(13) =8178a(14) =16278a(15) =32192a(16) =63019a(17) =121670a(18) =230964a(19) =430104a(20) =784626a(21) =1401292a(22) =2449868a(23) =4194304a(24) =7036530a(25) =11576916a(26) =18696432a(27) =29666704a(28) =46295513a(29) =71116846