a(n) = A159553(n)/n.

Terms

a(0) =2a(1) =3a(2) =4a(3) =7a(4) =8a(5) =24a(6) =20a(7) =67a(8) =96a(9) =256a(10) =188a(11) =1060a(12) =632a(13) =3228a(14) =5244a(15) =11427a(16) =7712a(17) =51888a(18) =27596a(19) =184912a(20) =232888a(21) =606628a(22) =364724a(23) =2807936a(24) =2405184a(25) =8671944a(26) =10368080a(27) =36873652a(28) =18512792a(29) =167268640