Second diagonal of A027446.

Terms

a(0) =3a(1) =5a(2) =7a(3) =27a(4) =22a(5) =130a(6) =225a(7) =595a(8) =532a(9) =5292a(10) =4830a(11) =57750a(12) =53460a(13) =49764a(14) =93093a(15) =1486485a(16) =1401400a(17) =25185160a(18) =23891868a(19) =22724988a(20) =21666840a(21) =476166600a(22) =455885430a(23) =2186310126a(24) =2100505176a(25) =6063549800a(26) =5842908500a(27) =163495203300a(28) =157949751960