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 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 7 |
| 6 | 13 |
| 7 | 32 |
| 8 | 71 |
| 9 | 170 |
| 10 | 406 |
| 11 | 1002 |
| 12 | 2469 |
| 13 | 6204 |
| 14 | 15644 |
| 15 | 39871 |
| 16 | 102116 |
| 17 | 263325 |
| 18 | 682079 |
| 19 | 1775600 |
| 20 | 4640220 |