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) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 33 |
| 4 | 292 |
| 5 | 3195 |
| 6 | 47154 |
| 7 | 824467 |
| 8 | 16783176 |
| 9 | 387434574 |
| 10 | 10000082730 |
| 11 | 285311855367 |
| 12 | 8916101760828 |
| 13 | 302875109296409 |
| 14 | 11112006847596746 |
| 15 | 437893890421433595 |
| 16 | 18446744074133995664 |
| 17 | 827240261886937844567 |
| 18 | 39346408075305857765940 |