Index of first occurrence of n in A324920.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =10a(5) =11a(6) =26a(7) =83a(8) =178a(9) =179a(10) =362a(11) =1835a(12) =9188a(13) =42709a(14) =162466a(15) =358487a(16) =1877938a(17) =11596979a(18) =57866702a(19) =94418279a(20) =1888365980