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 | 1 |
| 2 | 119 |
| 3 | 8830 |
| 4 | 546286 |
| 5 | 30754544 |
| 6 | 1636193228 |
| 7 | 83949041929 |
| 8 | 4204804906873 |
| 9 | 207204257344200 |
| 10 | 10097172081372386 |
| 11 | 488256657363269300 |
| 12 | 23483738804219826986 |
| 13 | 1125283073890577118094 |