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 | 2 |
| 2 | 82 |
| 3 | 5572 |
| 4 | 75260 |
| 5 | 728358 |
| 6 | 4108062 |
| 7 | 18838280 |
| 8 | 66983128 |
| 9 | 209732170 |
| 10 | 567864650 |
| 11 | 1413132492 |
| 12 | 3203059092 |
| 13 | 6839534702 |
| 14 | 13687432150 |
| 15 | 26203871248 |
| 16 | 47834595632 |
| 17 | 84386904210 |
| 18 | 143553121218 |
| 19 | 237664797140 |
| 20 | 382348873900 |
| 21 | 601693049782 |