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 | 15 |
| 2 | 22 |
| 3 | 77 |
| 4 | 1255 |
| 5 | 2012558 |
| 6 | 2679689 |
| 7 | 9289091 |
| 8 | 18004327 |
| 9 | 38887673 |
| 10 | 56634173 |
| 11 | 72533807 |
| 12 | 82010177 |
| 13 | 104651419 |
| 14 | 2056148051 |
| 15 | 2552338241 |
| 16 | 20390982757 |
| 17 | 27517052599 |
| 18 | 118159068427 |
| 19 | 749474411781 |
| 20 | 5134205287973 |
| 21 | 18028182516671 |