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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 22 |
| 5 | 87 |
| 6 | 354 |
| 7 | 1459 |
| 8 | 6056 |
| 9 | 25252 |
| 10 | 105632 |
| 11 | 442916 |
| 12 | 1860498 |
| 13 | 7826120 |
| 14 | 32956964 |
| 15 | 138911074 |
| 16 | 585926818 |
| 17 | 2472923499 |
| 18 | 10442263142 |
| 19 | 44112331275 |
| 20 | 186413949540 |
| 21 | 788000866243 |
| 22 | 3331853294090 |
| 23 | 14090947775581 |
| 24 | 59604161832772 |