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 | 0 |
| 2 | 1 |
| 3 | 21 |
| 4 | 148 |
| 5 | 1078 |
| 6 | 7898 |
| 7 | 60843 |
| 8 | 486390 |
| 9 | 3969956 |
| 10 | 33123937 |
| 11 | 280486145 |
| 12 | 2411806083 |