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) |
|---|---|
| 0 | 1 |
| 1 | 16 |
| 2 | 159 |
| 3 | 1260 |
| 4 | 8722 |
| 5 | 55152 |
| 6 | 326811 |
| 7 | 1844084 |
| 8 | 10015566 |
| 9 | 52754624 |
| 10 | 270976342 |
| 11 | 1362986520 |
| 12 | 6734927460 |
| 13 | 32775704608 |
| 14 | 157408497171 |
| 15 | 747269225028 |
| 16 | 3511471892470 |
| 17 | 16351481223840 |
| 18 | 75525932249922 |
| 19 | 346305571781224 |