Denominators of Postnikov's hook-length formula 2^n*(n+1)^(n-1)/n!.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =3a(5) =5a(6) =45a(7) =315a(8) =35a(9) =567a(10) =14175a(11) =1925a(12) =467775a(13) =868725a(14) =7007a(15) =638512875a(16) =638512875a(17) =14889875a(18) =97692469875a(19) =14849255421a(20) =28868125