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 | 1 |
| 2 | 1 |
| 3 | 6 |
| 4 | 30 |
| 5 | 284 |
| 6 | 2344 |
| 7 | 31632 |
| 8 | 492432 |
| 9 | 12098624 |
| 10 | 236007424 |
| 11 | 6065647616 |
| 12 | 159458086912 |
| 13 | 6086725226496 |
| 14 | 260007588237312 |