Positions of 4's in A038800 with offset 1.

Terms

a(0) =1a(1) =2a(2) =11a(3) =20a(4) =83a(5) =149a(6) =188a(7) =209a(8) =326a(9) =347a(10) =566a(11) =944a(12) =1301a(13) =1565a(14) =1574a(15) =1607a(16) =1805a(17) =1892a(18) =1943a(19) =2102a(20) =2228a(21) =2531a(22) =3173a(23) =3485a(24) =4379a(25) =5135a(26) =5534a(27) =6299a(28) =6722a(29) =6950