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 | 2 |
| 3 | 13 |
| 4 | 104 |
| 5 | 1357 |
| 6 | 22052 |
| 7 | 555325 |
| 8 | 17622590 |
| 9 | 680239111 |
| 10 | 31511481788 |
| 11 | 1717710101869 |
| 12 | 109014509616567 |
| 13 | 8596454332733239 |
| 14 | 783330147715515842 |
| 15 | 79369033657791374935 |
| 16 | 9105430313767018411610 |