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 | 5 |
| 2 | 7 |
| 3 | 76 |
| 4 | 18 |
| 5 | 1281 |
| 6 | 1872 |
| 7 | 19850 |
| 8 | 5518 |
| 9 | 334438 |
| 10 | 470902 |
| 11 | 4989654 |
| 12 | 1187177 |
| 13 | 83965631 |
| 14 | 122705027 |
| 15 | 1300996004 |
| 16 | 361349378 |
| 17 | 21919223969 |
| 18 | 30854252783 |
| 19 | 327011301795 |
| 20 | 77754211611 |