Duplicate of A008828.

Terms

a(0) =1a(1) =2a(2) =2a(3) =8a(4) =12a(5) =5a(6) =42a(7) =84a(8) =56a(9) =14a(10) =262a(11) =640a(12) =580a(13) =240a(14) =42a(15) =1828a(16) =5236a(17) =5894a(18) =3344a(19) =990