Second diagonal of A027516.

Terms

a(0) =3a(1) =5a(2) =8a(3) =36a(4) =180a(5) =364a(6) =259a(7) =182a(8) =132a(9) =385a(10) =285a(11) =10680a(12) =145376a(13) =219877a(14) =168165a(15) =64640a(16) =100192a(17) =545400a(18) =8122824a(19) =6384210a(20) =843458070a(21) =84042274932a(22) =15962119184