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 | 3 |
| 3 | 22 |
| 4 | 285 |
| 5 | 5481 |
| 6 | 141778 |
| 7 | 4638348 |
| 8 | 184138713 |
| 9 | 8612835715 |
| 10 | 464333035881 |
| 11 | 28368973183200 |
| 12 | 1938034271677595 |
| 13 | 146439782923866810 |
| 14 | 12129248258088578100 |
| 15 | 1092975597259714940696 |
| 16 | 106463932364272178140209 |
| 17 | 11148388021809242372111895 |
| 18 | 1248977393391271550436645787 |