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 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 6 |
| 7 | 21 |
| 8 | 56 |
| 9 | 126 |
| 10 | 252 |
| 11 | 492 |
| 12 | 1062 |
| 13 | 2667 |
| 14 | 7252 |
| 15 | 19509 |
| 16 | 49824 |
| 17 | 121019 |
| 18 | 286974 |
| 19 | 687384 |
| 20 | 1702308 |
| 21 | 4357383 |
| 22 | 11322408 |
| 23 | 29307458 |
| 24 | 74897808 |
| 25 | 189349041 |
| 26 | 477491356 |
| 27 | 1211349276 |
| 28 | 3103673406 |
| 29 | 8017385416 |
| 30 | 20780391882 |
| 31 | 53812468392 |
| 32 | 138999941172 |
| 33 | 358502419242 |