Boustrophedon transform of 1, 2, 2, 2, 2, ...

Terms

a(0) =1a(1) =3a(2) =7a(3) =16a(4) =43a(5) =138a(6) =527a(7) =2346a(8) =11943a(9) =68418a(10) =435547a(11) =3050026a(12) =23300443a(13) =192835698a(14) =1718682167a(15) =16412205306a(16) =167173350543