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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 10 |
| 6 | 1382 |
| 7 | 420 |
| 8 | 10851 |
| 9 | 438670 |
| 10 | 7333662 |
| 11 | 51270780 |
| 12 | 7090922730 |
| 13 | 2155381956 |
| 14 | 94997844116 |
| 15 | 68926730208040 |
| 16 | 1780853160521127 |
| 17 | 541314450257070 |
| 18 | 52630543106106954746 |
| 19 | 15997766769574912140 |
| 20 | 10965474176850863126142 |
| 21 | 1003264444985926729776060 |
| 22 | 35069919669919290536128980 |