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 | 2 |
| 3 | 7 |
| 4 | 9 |
| 5 | 25 |
| 6 | 84 |
| 7 | 109 |
| 8 | 302 |
| 9 | 1015 |
| 10 | 1317 |
| 11 | 3649 |
| 12 | 12264 |
| 13 | 15913 |
| 14 | 44090 |
| 15 | 148183 |
| 16 | 192273 |
| 17 | 532729 |
| 18 | 1790460 |
| 19 | 2323189 |
| 20 | 6436838 |
| 21 | 21633703 |
| 22 | 28070541 |
| 23 | 77774785 |
| 24 | 261394896 |
| 25 | 339169681 |
| 26 | 939734258 |
| 27 | 3158372455 |
| 28 | 4098106713 |
| 29 | 11354585881 |
| 30 | 38161864356 |