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 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 6 |
| 6 | 15 |
| 7 | 34 |
| 8 | 105 |
| 9 | 384 |
| 10 | 1658 |
| 11 | 8135 |
| 12 | 41407 |
| 13 | 205211 |
| 14 | 963708 |
| 15 | 4231059 |
| 16 | 17295730 |
| 17 | 65807588 |
| 18 | 233346408 |
| 19 | 772518828 |
| 20 | 2392611091 |
| 21 | 6946116261 |
| 22 | 18937468347 |
| 23 | 48568206996 |