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 | 2 |
| 2 | 13 |
| 3 | 131 |
| 4 | 1741 |
| 5 | 28451 |
| 6 | 549757 |
| 7 | 12247211 |
| 8 | 308953453 |
| 9 | 8706012827 |
| 10 | 271093643293 |
| 11 | 9245857326635 |
| 12 | 342832527086797 |
| 13 | 13733511532751099 |
| 14 | 591127774090746493 |
| 15 | 27209560375187822795 |
| 16 | 1333804962202136755501 |