Diagonal of A083796.

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =14a(5) =30a(6) =39a(7) =28a(8) =804a(9) =1620a(10) =2465a(11) =15048a(12) =27642a(13) =138502a(14) =360255a(15) =360120a(16) =720584a(17) =8648478a(18) =12252069a(19) =208287880a(20) =232792350a(21) =232792098a(22) =232792307a(23) =2327925312a(24) =5354228580a(25) =16062686250a(26) =26771144049a(27) =26771143896a(28) =80313432794