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 | 3 |
| 3 | 11 |
| 4 | 47 |
| 5 | 231 |
| 6 | 1303 |
| 7 | 8431 |
| 8 | 62391 |
| 9 | 524495 |
| 10 | 4960775 |
| 11 | 52223775 |
| 12 | 605595319 |
| 13 | 7664578639 |
| 14 | 105046841127 |
| 15 | 1548880173119 |
| 16 | 24434511267863 |
| 17 | 410503693136559 |
| 18 | 7315133279097607 |
| 19 | 137787834979031839 |
| 20 | 2734998201208351479 |
| 21 | 57053644562104430735 |
| 22 | 1247772806059088954855 |