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 | 8 |
| 6 | 13 |
| 7 | 63 |
| 8 | 167 |
| 9 | 1227 |
| 10 | 5240 |
| 11 | 46958 |
| 12 | 297080 |
| 13 | 3108808 |
| 14 | 26714243 |
| 15 | 325635647 |
| 16 | 3535022425 |
| 17 | 49403859787 |
| 18 | 646713449897 |
| 19 | 10221697892707 |
| 20 | 156049674957354 |
| 21 | 2756431502525358 |
| 22 | 48028121269507891 |
| 23 | 940216720983170113 |
| 24 | 18359095114316009613 |