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 | 3 |
| 2 | 8 |
| 3 | 21 |
| 4 | 54 |
| 5 | 136 |
| 6 | 337 |
| 7 | 825 |
| 8 | 2000 |
| 9 | 4809 |
| 10 | 11484 |
| 11 | 27264 |
| 12 | 64401 |
| 13 | 151455 |
| 14 | 354808 |
| 15 | 828349 |
| 16 | 1927986 |
| 17 | 4475080 |
| 18 | 10361441 |
| 19 | 23936565 |
| 20 | 55183904 |
| 21 | 126983569 |
| 22 | 291698040 |
| 23 | 669004352 |
| 24 | 1532095329 |
| 25 | 3503889147 |
| 26 | 8003207912 |
| 27 | 18258464741 |
| 28 | 41608726254 |
| 29 | 94722900936 |
| 30 | 215428701233 |