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 | 7 |
| 3 | 69 |
| 4 | 783 |
| 5 | 9597 |
| 6 | 123495 |
| 7 | 1643397 |
| 8 | 22413183 |
| 9 | 311466829 |
| 10 | 4392857431 |
| 11 | 62702224213 |
| 12 | 903886452975 |
| 13 | 13138698859677 |
| 14 | 192337495360071 |
| 15 | 2832859169364261 |
| 16 | 41946319269028191 |
| 17 | 624009420903043821 |