a(n) = 168*2^n - 26 (n>=1).

Terms

a(0) =310a(1) =646a(2) =1318a(3) =2662a(4) =5350a(5) =10726a(6) =21478a(7) =42982a(8) =85990a(9) =172006a(10) =344038a(11) =688102a(12) =1376230a(13) =2752486a(14) =5504998a(15) =11010022a(16) =22020070a(17) =44040166a(18) =88080358a(19) =176160742a(20) =352321510a(21) =704643046a(22) =1409286118a(23) =2818572262a(24) =5637144550a(25) =11274289126a(26) =22548578278a(27) =45097156582a(28) =90194313190