Duplicate of A034889.

Terms

a(0) =0a(1) =1a(2) =1a(3) =3a(4) =10a(5) =61a(6) =564a(7) =7593a(8) =123874a(9) =2262877a(10) =44190279a(11) =904777809a(12) =19207129217