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 | 7 |
| 3 | 9 |
| 4 | 39 |
| 5 | 57 |
| 6 | 199 |
| 7 | 313 |
| 8 | 967 |
| 9 | 1593 |
| 10 | 4551 |
| 11 | 7737 |
| 12 | 20935 |
| 13 | 36409 |
| 14 | 94663 |
| 15 | 167481 |
| 16 | 422343 |
| 17 | 757305 |
| 18 | 1864135 |
| 19 | 3378745 |
| 20 | 8155591 |
| 21 | 14913081 |
| 22 | 35418567 |
| 23 | 65244729 |
| 24 | 152859079 |
| 25 | 283348537 |
| 26 | 656175559 |
| 27 | 1222872633 |
| 28 | 2803659207 |
| 29 | 5249404473 |