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 | 2 |
| 2 | 7 |
| 3 | 38 |
| 4 | 122 |
| 5 | 2766 |
| 6 | 64686 |
| 7 | 1972296 |
| 8 | 5387768 |
| 9 | 56208248 |
| 10 | 753815160 |
| 11 | 130065181784 |
| 12 | 5398921735160 |