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 | 2 |
| 2 | 7 |
| 3 | 25 |
| 4 | 115 |
| 5 | 670 |
| 6 | 4324 |
| 7 | 30657 |
| 8 | 229568 |
| 9 | 1775675 |
| 10 | 14156112 |
| 11 | 115500275 |
| 12 | 960392564 |