a(0) = 1; for n >= 1, a(n) = A059897(n, a(n-1)).

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =20a(7) =140a(8) =70a(9) =630a(10) =63a(11) =693a(12) =8316a(13) =108108a(14) =30888a(15) =51480a(16) =823680a(17) =14002560a(18) =777920a(19) =14780480a(20) =739024a(21) =15519504a(22) =2821728a(23) =64899744a(24) =43266496a(25) =1081662400a(26) =166409600a(27) =4493059200a(28) =160466400a(29) =4653525600