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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 15 |
| 6 | 13 |
| 7 | 51 |
| 8 | 297 |
| 9 | 75 |
| 10 | 643 |
| 11 | 981 |
| 12 | 1761 |
| 13 | 897 |
| 14 | 2775 |
| 15 | 118113 |
| 16 | 44061 |
| 17 | 5851 |
| 18 | 18531 |
| 19 | 189093 |
| 20 | 69661 |