a(n) = Sum_{k=0..7} binomial(n,k).

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =32a(6) =64a(7) =128a(8) =255a(9) =502a(10) =968a(11) =1816a(12) =3302a(13) =5812a(14) =9908a(15) =16384a(16) =26333a(17) =41226a(18) =63004a(19) =94184a(20) =137980a(21) =198440a(22) =280600a(23) =390656a(24) =536155a(25) =726206a(26) =971712a(27) =1285624a(28) =1683218a(29) =2182396