Triangle of earliest friendly numbers having n friends.

Terms

a(0) =6a(1) =28a(2) =6a(3) =28a(4) =496a(5) =84a(6) =270a(7) =1488a(8) =1638a(9) =84a(10) =270a(11) =1488a(12) =1638a(13) =24384a(14) =210a(15) =17360a(16) =43400a(17) =284480a(18) =2229500a(19) =2886100a(20) =3780a(21) =66960a(22) =167400a(23) =406224a(24) =1097280a(25) =6656832a(26) =13035330a(27) =3780a(28) =66960a(29) =167400