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 | 14 |
| 2 | -862 |
| 3 | -41692 |
| 4 | 2152300 |
| 5 | 206572744 |
| 6 | -8493648584 |
| 7 | -1430234859088 |
| 8 | 42880673385872 |
| 9 | 12705837274723040 |
| 10 | -230428050134150624 |
| 11 | -137653751068447871936 |
| 12 | 754569132502974755008 |
| 13 | 1758215991420055828669568 |
| 14 | 14236680031434866820993920 |
| 15 | -25843381744473778798759726336 |