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 | 6 |
| 2 | 78 |
| 3 | 1518 |
| 4 | 39390 |
| 5 | 1277646 |
| 6 | 49729758 |
| 7 | 2258233998 |
| 8 | 117196187550 |
| 9 | 6842432930766 |
| 10 | 443879517004638 |
| 11 | 31674687990494478 |
| 12 | 2465744921215207710 |
| 13 | 207943837884583262286 |
| 14 | 18885506918597311159518 |
| 15 | 1837699347783655374914958 |
| 16 | 190743171535070652261555870 |
| 17 | 21035482423625416328497024206 |