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 | 2 |
| 2 | 10 |
| 3 | 116 |
| 4 | 3652 |
| 5 | 285704 |
| 6 | 61946920 |
| 7 | 33736398032 |
| 8 | 51083363186704 |
| 9 | 194585754101247008 |
| 10 | 2061787082699360148640 |
| 11 | 54969782721182164414355264 |