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 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 87 |
| 5 | 817 |
| 6 | 9819 |
| 7 | 143029 |
| 8 | 2442783 |
| 9 | 47817913 |
| 10 | 1054997475 |
| 11 | 25895101885 |
| 12 | 699790692519 |
| 13 | 20644163034049 |
| 14 | 660099532324971 |
| 15 | 22739373410768581 |
| 16 | 839552217608213295 |
| 17 | 33071685749731393225 |
| 18 | 1384473468760664408307 |