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 | 2 |
| 2 | 13 |
| 3 | 76 |
| 4 | 263 |
| 5 | 2578 |
| 6 | 36979 |
| 7 | 33976 |
| 8 | 622637 |
| 9 | 11064338 |
| 10 | 11757173 |
| 11 | 255865444 |
| 12 | 1346255081 |
| 13 | 3852854518 |
| 14 | 116752370597 |
| 15 | 3473755390832 |
| 16 | 3610501179557 |
| 17 | 3481569435902 |
| 18 | 133330680156299 |
| 19 | 129049485078524 |
| 20 | 5457995496252709 |
| 21 | 227848175409504262 |
| 22 | 234389556075339277 |