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 | 7 |
| 2 | -98 |
| 3 | 1715 |
| 4 | -28812 |
| 5 | 369754 |
| 6 | 0 |
| 7 | -234003861 |
| 8 | 11187831655 |
| 9 | -379208609780 |
| 10 | 10505577339166 |
| 11 | -237021026782414 |
| 12 | 3747904201751920 |
| 13 | 0 |
| 14 | -3136632447485449416 |
| 15 | 165539296779239527515 |
| 16 | -6087083256734433868530 |
| 17 | 180571542422445599417377 |
| 18 | -4318405727843353425012650 |