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 | 0 |
| 1 | 9 |
| 2 | 41 |
| 3 | 919 |
| 4 | 4729 |
| 5 | 99709 |
| 6 | 485863 |
| 7 | 9424673 |
| 8 | 38074743 |
| 9 | 801763489 |
| 10 | 2097800623 |
| 11 | 60727302517 |
| 12 | 996224275833 |
| 13 | 3780508946331 |
| 14 | 75385758524527 |
| 15 | 124508045065437 |
| 16 | 4906913903735329 |
| 17 | 85296581467695669 |
| 18 | 211790234832169331 |
| 19 | 5675465116607065549 |