Sum of factorials of prime factors, with multiplicity.

Terms

a(0) =2a(1) =6a(2) =4a(3) =120a(4) =8a(5) =5040a(6) =6a(7) =12a(8) =122a(9) =39916800a(10) =10a(11) =6227020800a(12) =5042a(13) =126a(14) =8a(16) =14a(18) =124a(19) =5046a(20) =39916802a(22) =12a(23) =240a(24) =6227020802a(25) =18a(26) =5044