a(n) is the smallest k such that A361902(k) = n, or -1 if no such k exists.

Terms

a(0) =2a(1) =1a(2) =-1a(3) =0a(4) =8a(5) =24a(6) =33a(7) =90a(8) =116a(9) =25a(10) =402a(11) =140a(12) =85a(13) =120a(14) =692a(15) =91a(16) =472a(17) =1240a(18) =369a(19) =762a(20) =694a(21) =551a(22) =3290a(23) =322a(24) =121a(25) =2758a(26) =1164a(27) =321a(28) =778a(29) =3144