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) |
|---|---|
| 2 | 1 |
| 3 | 6 |
| 4 | 46 |
| 5 | 452 |
| 6 | 4852 |
| 7 | 52972 |
| 8 | 587047 |
| 9 | 6550808 |
| 10 | 73483256 |
| 11 | 827801468 |
| 12 | 9360123740 |
| 13 | 106189359544 |
| 14 | 1208328304864 |
| 15 | 13787042250528 |
| 16 | 157700137398689 |
| 17 | 1807893066408464 |
| 18 | 20768681225892328 |
| 19 | 239037464947999900 |
| 20 | 2755989928117365244 |
| 21 | 31826208029615881656 |
| 22 | 368074022535205870382 |