Locations of the first occurrence of pair (0,n) in the van Eck sequence (A181391).

Terms

a(0) =0a(1) =1a(2) =3a(3) =20a(4) =24a(5) =10a(6) =30a(7) =276a(8) =388a(9) =81a(10) =225a(11) =726a(12) =2935a(13) =1408a(14) =7718a(15) =5624a(16) =5680a(17) =85998a(18) =26706a(19) =546290a(20) =1112929a(21) =702575a(22) =3425417a(23) =10537360a(24) =21301906a(25) =217230900a(26) =108698091a(27) =32381774a(28) =846522986a(29) =851764846