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 | 20 |
| 2 | 492 |
| 3 | 9288 |
| 4 | 163504 |
| 5 | 2616064 |
| 6 | 39369649 |
| 7 | 561744656 |
| 8 | 7690052788 |
| 9 | 101717711304 |
| 10 | 1308089742576 |
| 11 | 16431681189504 |
| 12 | 202396884008657 |
| 13 | 2452192780001276 |
| 14 | 29299135239719708 |
| 15 | 345967823847659992 |
| 16 | 4044638027348853616 |
| 17 | 46886410125951835648 |
| 18 | 539632277597240357409 |