The values of k in A220141.

Terms

a(0) =2a(1) =6a(2) =18a(3) =24a(4) =42a(5) =54a(6) =120a(7) =258a(8) =396a(9) =480a(10) =612a(11) =840a(12) =1074a(13) =1800a(14) =2130a(15) =2172a(16) =2256a(17) =2550a(18) =2694a(19) =3282a(20) =3492a(21) =3690a(22) =3810a(23) =4110a(24) =4626a(25) =4788a(26) =4860a(27) =4992a(28) =5148a(29) =5280