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 | 2 |
| 3 | 5 |
| 4 | 6 |
| 5 | 10 |
| 6 | 30 |
| 7 | 70 |
| 8 | 1565 |
| 9 | 2806 |
| 10 | 3126 |
| 11 | 51670 |
| 12 | 58290 |
| 13 | 214405 |
| 14 | 285286 |
| 15 | 378258 |
| 16 | 1854766 |
| 17 | 2170486 |
| 18 | 2222122 |
| 19 | 2247610 |
| 20 | 3463230 |
| 21 | 4147522 |
| 22 | 5942526 |
| 23 | 9381126 |
| 24 | 14818486 |
| 25 | 15743890 |
| 26 | 20162858 |
| 27 | 34087054 |
| 28 | 34838686 |
| 29 | 38742166 |
| 30 | 71067430 |