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 | 17 |
| 3 | 130 |
| 4 | 1445 |
| 5 | 19676 |
| 6 | 288517 |
| 7 | 4768240 |
| 8 | 86825545 |
| 9 | 1707427792 |
| 10 | 36133006121 |
| 11 | 817372392464 |
| 12 | 19631012216653 |
| 13 | 498360729728512 |
| 14 | 13320962518548973 |
| 15 | 373554936371438896 |
| 16 | 10956734043885307793 |
| 17 | 335251566923262901760 |
| 18 | 10675684185273726205393 |
| 19 | 353052079426340899698736 |