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 | 23 |
| 3 | 261 |
| 4 | 3787 |
| 5 | 63395 |
| 6 | 1191041 |
| 7 | 24547919 |
| 8 | 549727747 |
| 9 | 13239969349 |
| 10 | 340470351905 |
| 11 | 9279758909457 |
| 12 | 266461484866363 |