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 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 7 |
| 6 | 28 |
| 7 | 151 |
| 8 | 907 |
| 9 | 6467 |
| 10 | 51151 |
| 11 | 458478 |
| 12 | 4455476 |
| 13 | 48162974 |
| 14 | 557022350 |
| 15 | 7020022164 |
| 16 | 94129389215 |
| 17 | 1357181821028 |
| 18 | 20661645476348 |