a(n) = A056188(n)/n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =6a(5) =2a(6) =18a(7) =16a(8) =38a(9) =26a(10) =186a(11) =134a(12) =630a(13) =340a(14) =1056a(15) =2048a(16) =7710a(17) =4490a(18) =27594a(19) =24664a(20) =55502a(21) =63260a(22) =364722a(23) =240398a(24) =1076426a(25) =890532a(26) =3314018a(27) =4708916a(28) =18512790a(29) =11761532