a(n) = A276086(A328622(n)).

Terms

a(0) =1a(1) =2a(2) =9a(3) =18a(4) =3a(5) =6a(6) =25a(7) =50a(8) =225a(9) =450a(10) =75a(11) =150a(12) =625a(13) =1250a(14) =5625a(15) =11250a(16) =1875a(17) =3750a(18) =5a(19) =10a(20) =45a(21) =90a(22) =15a(23) =30a(24) =125a(25) =250a(26) =1125a(27) =2250a(28) =375a(29) =750