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 | -2 |
| 1 | -1 |
| 2 | -3 |
| 3 | -11 |
| 4 | -13 |
| 5 | 971 |
| 6 | 31469 |
| 7 | 856073 |
| 8 | 23576391 |
| 9 | 686321335 |
| 10 | 21381059609 |
| 11 | 714688329389 |
| 12 | 25606611695675 |
| 13 | 981043357956611 |
| 14 | 40073886188532741 |
| 15 | 1740059447428511761 |
| 16 | 80079381261983807759 |
| 17 | 3895126220983308449519 |
| 18 | 199726027609854787271729 |
| 19 | 10769816560735764585313397 |