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 | 1 |
| 2 | 4 |
| 3 | 31 |
| 4 | 347 |
| 5 | 4860 |
| 6 | 79174 |
| 7 | 1440837 |
| 8 | 28584939 |
| 9 | 608533714 |
| 10 | 13751688892 |
| 11 | 327333165775 |
| 12 | 8160149459870 |
| 13 | 212121519165566 |
| 14 | 5730205766494409 |
| 15 | 160425928432680795 |
| 16 | 4644491031188023566 |
| 17 | 138792548776938444503 |