Index where n first appears in A381658.

Terms

a(0) =1a(1) =4a(2) =11a(3) =21a(4) =31a(5) =69a(6) =93a(7) =96a(8) =174a(9) =222a(10) =263a(11) =433a(12) =529a(13) =633a(14) =671a(15) =732a(16) =1006a(17) =1298a(18) =1388a(19) =1519a(20) =1688a(21) =1813a(22) =2018a(23) =2220a(24) =2507a(25) =2788a(26) =3601a(27) =3949a(28) =4155a(29) =4498