a(n) = 5*n + 2^n.

Terms

a(0) =1a(1) =7a(2) =14a(3) =23a(4) =36a(5) =57a(6) =94a(7) =163a(8) =296a(9) =557a(10) =1074a(11) =2103a(12) =4156a(13) =8257a(14) =16454a(15) =32843a(16) =65616a(17) =131157a(18) =262234a(19) =524383a(20) =1048676a(21) =2097257a(22) =4194414a(23) =8388723a(24) =16777336a(25) =33554557a(26) =67108994a(27) =134217863a(28) =268435596a(29) =536871057