a(n) is the smallest k such that A345699(k) = n.

Terms

a(0) =1a(1) =4a(2) =16a(3) =20a(4) =1369a(5) =68a(6) =10201a(7) =148a(8) =272a(9) =5476a(10) =29997529a(11) =340a(12) =351649a(13) =40804a(14) =21904a(15) =596a(16) =674041a(17) =1360a(18) =1852321a(19) =21908a(20) =163216a(21) =119990116a(23) =2020a(24) =2301289a(25) =1406596a(26) =6416a(27) =204020a(28) =166497457681a(29) =87632a(30) =38862996769