First differences of A328078.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =6a(5) =12a(6) =21a(7) =43a(8) =78a(9) =156a(10) =293a(11) =583a(12) =1118a(13) =2208a(14) =4277a(15) =8423a(16) =16422a(17) =32280a(18) =63117a(19) =123951a(20) =242782a(21) =476560a(22) =934181a(23) =1833255a(24) =3595254a(25) =7054600a(26) =13837949a(27) =27151135a(28) =53264270a(29) =104505920