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 | 5 |
| 2 | 139 |
| 3 | 8920 |
| 4 | 3140313 |
| 5 | 386431752 |
| 6 | 514497175965 |
| 7 | 279843094350688 |
| 8 | 309269596069652505 |
| 9 | 148299194161602748000 |
| 10 | 987531598214016848643771 |
| 11 | 736658715557644007659575408 |
| 12 | 8631341032315887149556551616665 |
| 13 | 9247541236236479803404967113812944 |
| 14 | 11617153578430950909883928682002963745 |