a(n+1) = 2*a(n) + A298338(n-1), with a(1) = 1.

Terms

a(0) =1a(1) =3a(2) =7a(3) =15a(4) =33a(5) =71a(6) =151a(7) =319a(8) =667a(9) =1385a(10) =2855a(11) =5855a(12) =11949a(13) =24299a(14) =49255a(15) =99597a(16) =200967a(17) =404845a(18) =814425a(19) =1636581a(20) =3285713a(21) =6591853a(22) =13216829a(23) =26487447a(24) =53062045a(25) =106265431a(26) =212759755a(27) =425890401a(28) =852381243a(29) =1705734905