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 | 17 |
| 3 | -329 |
| 4 | -3935 |
| 5 | 14567 |
| 6 | 731569 |
| 7 | 2324119 |
| 8 | -147602623 |
| 9 | -1628192825 |
| 10 | 31112205649 |
| 11 | 738807143543 |
| 12 | -5779846383647 |
| 13 | -324160867806041 |
| 14 | 135290020954865 |
| 15 | 146171098923790423 |
| 16 | 958258482408197761 |
| 17 | -68131793272123312249 |
| 18 | -998215167334922767727 |