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 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | -272 |
| 5 | -8524 |
| 6 | -96596 |
| 7 | 9634752 |
| 8 | 983055168 |
| 9 | 36429411456 |
| 10 | -4303305703296 |
| 11 | -1051644384152064 |
| 12 | -89651253435644160 |
| 13 | 10632887072757561600 |
| 14 | 5599203549778990667520 |
| 15 | 914684633796830925275136 |
| 16 | -89559567563652079025946624 |
| 17 | -104514775371103880549281775616 |