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 | 3 |
| 2 | 15 |
| 3 | 123 |
| 4 | 1623 |
| 5 | 35427 |
| 6 | 1349727 |
| 7 | 94653195 |
| 8 | 12690736167 |
| 9 | 3325408581747 |
| 10 | 1722610175806383 |
| 11 | 1774299723226774683 |
| 12 | 3644417103927252697335 |
| 13 | 14949404433893216347632003 |
| 14 | 122555228634241017164802041343 |
| 15 | 2008680242472430855727593100321067 |