The radical of the swinging factorial A056040 for odd indices.

Terms

a(0) =1a(1) =6a(2) =30a(3) =70a(4) =210a(5) =462a(6) =6006a(7) =4290a(8) =72930a(9) =461890a(10) =1939938a(11) =4056234a(12) =6760390a(13) =1560090a(14) =6463230a(15) =200360130a(16) =2203961430a(17) =907513530a(18) =33578000610a(19) =22974421470a(20) =941951280270a(22) =526024740930