a(n) = 5^n * n!.A052562a(n) = 5^n * n!.Terms a(0) =1a(1) =5a(2) =50a(3) =750a(4) =15000a(5) =375000a(6) =11250000a(7) =393750000a(8) =15750000000a(9) =708750000000External referencesoeis: A052562