Smallest k such that A069624(k) = n.

Terms

a(0) =1a(1) =4a(2) =9a(3) =27a(4) =81a(5) =256a(6) =1024a(7) =4096a(8) =16384a(9) =78125a(10) =390625a(11) =1953125a(12) =10077696a(13) =60466176a(14) =362797056a(15) =2176782336a(16) =13841287201a(17) =96889010407a(18) =678223072849