Euler transform of 1, 5, 9, 13, 17, 21, 25, 29, 33, ... (A016813).

Terms

a(0) =1a(1) =6a(2) =15a(3) =43a(4) =105a(5) =271a(6) =633a(7) =1501a(8) =3389a(9) =7598a(10) =16561a(11) =35710a(12) =75444a(13) =157618a(14) =324291a(15) =659949a(16) =1326571a(17) =2640033a(18) =5199264a(19) =10147142a(20) =19624563a(21) =37643761a(22) =71629723a(23) =135288468a(24) =253682683a(25) =472470635a(26) =874204574a(27) =1607506045a(28) =2938259227a(29) =5340032114