This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 13 |
| 3 | 1027 |
| 4 | 468481 |
| 5 | 2890927 |
| 6 | 37009999 |
| 7 | 228383233 |
| 8 | 2126334691 |
| 9 | 104180336299 |
| 10 | 8230246567621 |
| 11 | 34238014256797 |
| 12 | 76626723259567 |
| 13 | 131147819778859 |
| 14 | 219609509027857 |
| 15 | 472852182249889 |
| 16 | 1033753383066391 |
| 17 | 2704803126286963 |
| 18 | 10360677762529861 |
| 19 | 16436880348770011 |
| 20 | 17349151213200703 |
| 21 | 81666517262244889 |
| 22 | 686779630199762359 |