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 | 1 |
| 2 | 2 |
| 3 | 10 |
| 4 | 141 |
| 5 | 6769 |
| 6 | 1298995 |
| 7 | 1148840085 |
| 8 | 5307091649182 |
| 9 | 143026276277298216 |
| 10 | 24801104674619158730662 |
| 11 | 30190572492693121799801655311 |
| 12 | 278937095127086600900558327826721594 |