Numbers n such that there exists an x!=n that makes {n,n,x,x} an amicable multiset.

Terms

a(0) =1441440a(1) =1860768a(2) =3205440a(3) =3378240a(4) =3423420a(5) =3914820a(6) =4029480a(7) =4437720a(8) =5738040a(9) =6093360a(10) =6807240a(11) =7136640a(12) =7239120a(13) =7551360a(14) =9402120a(15) =10204740a(16) =12270720a(17) =12405120a(18) =12942720a(19) =13495680a(20) =14627340a(21) =14725620a(22) =15233400a(23) =17166240a(24) =18097800a(25) =19158048a(26) =23023440