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 | 3 |
| 3 | 12 |
| 4 | 46 |
| 5 | 523 |
| 6 | 8250 |
| 7 | 164295 |
| 8 | 6303961 |
| 9 | 332058205 |
| 10 | 27569938407 |
| 11 | 3963913990343 |
| 12 | 828978948856945 |