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 | 15 |
| 4 | 19 |
| 5 | 132 |
| 6 | 1474 |
| 7 | 1977 |
| 8 | 10392 |
| 9 | 12992 |
| 10 | 44777 |
| 11 | 59412 |
| 12 | 170685 |
| 13 | 217607 |
| 14 | 704791 |
| 15 | 818133 |
| 16 | 1387423 |
| 17 | 2208674 |
| 18 | 3206215 |
| 19 | 12732462 |
| 20 | 13962681 |
| 21 | 24593168 |
| 22 | 39744274 |
| 23 | 55804517 |
| 24 | 130269696 |
| 25 | 426536424 |
| 26 | 546807194 |
| 27 | 1030799587 |
| 28 | 1139987135 |