a(n) is the number of positive divisors of A003266(n).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =20a(6) =40a(7) =120a(8) =288a(9) =864a(10) =1728a(11) =4800a(12) =9600a(13) =28800a(14) =84480a(15) =304128a(16) =608256a(17) =2322432a(18) =9289728a(19) =40642560a(20) =116121600a(21) =348364800a(22) =696729600a(23) =3185049600a(24) =8918138880a(25) =26754416640a(26) =149824733184a(27) =624269721600