a(n) is the least number k such that A349497(k) = n, or -1 if no such k exists.

Terms

a(0) =1a(1) =6a(2) =24a(3) =170a(4) =140a(5) =270a(6) =1140a(7) =630a(8) =1400a(9) =4420a(10) =2016a(11) =8680a(12) =11704a(13) =18620a(14) =8190a(15) =20196a(16) =12960a(17) =90860a(18) =13860a(19) =30800a(20) =55860a(21) =148770a(22) =51408a(23) =30240a(24) =78120a(25) =242060a(26) =153120a(27) =282555a(28) =65520a(29) =564564