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 | 2 |
| 3 | 4 |
| 4 | 170 |
| 5 | 9860 |
| 6 | 23450 |
| 7 | 56980 |
| 8 | 56980 |
| 9 | 6723767050 |
| 10 | 48276858630 |
| 11 | 77460393371130 |
| 12 | 97581361797920 |
| 13 | 97581361797920 |
| 14 | 1269928100726715430 |