a(1) = 1; a(n) = n*a(n-1) if n does not divide a(n-1), otherwise a(n) = a(n-1).

A066616

a(1) = 1; a(n) = n*a(n-1) if n does not divide a(n-1), otherwise a(n) = a(n-1).

Terms

    a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =120a(6) =840a(7) =840a(8) =7560a(9) =7560a(10) =83160a(11) =83160a(12) =1081080a(13) =1081080a(14) =1081080a(15) =17297280a(16) =294053760a(17) =294053760a(18) =5587021440a(19) =5587021440a(20) =5587021440a(21) =5587021440a(22) =128501493120a(23) =128501493120

External references