a(n) = Sum_{k=0..9} 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) =1023a(11) =2036a(12) =4017a(13) =7814a(14) =14913a(15) =27824a(16) =50643a(17) =89846a(18) =155382a(19) =262144a(20) =431910a(21) =695860a(22) =1097790a(23) =1698160a(24) =2579130a(25) =3850756a(26) =5658537a(27) =8192524a(28) =11698223a(29) =16489546