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 | 26 |
| 3 | 253 |
| 4 | 2515 |
| 5 | 25007 |
| 6 | 250110 |
| 7 | 2500209 |
| 8 | 25000135 |
| 9 | 250002220 |
| 10 | 2500000243 |
| 11 | 25000027724 |
| 12 | 250000009260 |