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 | 3 |
| 2 | 81 |
| 3 | 3313 |
| 4 | 171282 |
| 5 | 9444158 |
| 6 | 541659909 |
| 7 | 31819176850 |
| 8 | 1902508129720 |
| 9 | 115307287484560 |
| 10 | 7064528615347192 |
| 11 | 436658221692698200 |
| 12 | 27188662712300575980 |
| 13 | 1703444238720524912060 |