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 | 12 |
| 3 | 100 |
| 4 | 980 |
| 5 | 10584 |
| 6 | 121968 |
| 7 | 1472328 |
| 8 | 18404100 |
| 9 | 236390440 |
| 10 | 3103161776 |
| 11 | 41469525552 |
| 12 | 562496897872 |
| 13 | 7726605740000 |
| 14 | 107289439704000 |
| 15 | 1503840313184400 |
| 16 | 21252802073091300 |