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 | 1 |
| 2 | 47 |
| 3 | 2208 |
| 4 | 103729 |
| 5 | 4873055 |
| 6 | 228929856 |
| 7 | 10754830177 |
| 8 | 505248088463 |
| 9 | 23735905327584 |
| 10 | 1115082302307985 |
| 11 | 52385132303147711 |
| 12 | 2460986135945634432 |
| 13 | 115613963257141670593 |
| 14 | 5431395286949712883439 |
| 15 | 255159964523379363851040 |
| 16 | 11987086937311880388115441 |