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 | 96 |
| 4 | 729 |
| 5 | 6327 |
| 6 | 61380 |
| 7 | 655944 |
| 8 | 7642557 |
| 9 | 96338925 |
| 10 | 1306003803 |
| 11 | 18947038404 |
| 12 | 292956751236 |
| 13 | 4810423131828 |
| 14 | 83620543389804 |
| 15 | 1534493081643552 |
| 16 | 29649997606132197 |
| 17 | 601828286370137865 |
| 18 | 12804746026265284149 |