The least integer k >= 0 for which A328578(k) = A257993(A276086(A276086(k))) = n.

Terms

a(0) =1a(1) =0a(2) =2a(3) =4a(4) =10a(5) =20a(6) =28a(7) =82a(8) =116a(9) =148a(10) =208a(11) =418a(12) =838a(13) =1048a(14) =1466a(15) =1858a(16) =2276a(17) =4612a(18) =9028a(19) =11546a(20) =16162a(21) =18478a(22) =23098a(23) =27688a(24) =30028a(25) =90086a(26) =147838a(27) =180178a(28) =240232a(29) =297988