Periods associated with A217611.

Terms

a(0) =2a(1) =1a(2) =6a(3) =3a(4) =18a(5) =9a(6) =30a(7) =42a(8) =78a(9) =114a(10) =138a(11) =87a(12) =330a(13) =318a(14) =189a(15) =462a(16) =408a(17) =504a(18) =303a(19) =561a(20) =1002a(21) =2040a(22) =1794a(23) =1746a(24) =2418a(25) =2790a(26) =1389a(27) =3894a(28) =4722a(29) =6738