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) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | 3 |
| 4 | 1 |
| 5 | -15 |
| 6 | 24 |
| 7 | -7 |
| 8 | 405 |
| 9 | -2268 |
| 10 | 2500 |
| 11 | 2 |
| 12 | -405 |
| 13 | 6048 |
| 14 | -20000 |
| 15 | 16875 |
| 16 | -11 |
| 17 | 7425 |
| 18 | -266112 |
| 19 | 2000000 |
| 20 | -4640625 |
| 21 | 3176523 |
| 22 | 143 |
| 23 | -312741 |
| 24 | 25474176 |
| 25 | -390000000 |
| 26 | 1879453125 |
| 27 | -3344878719 |
| 28 | 1927561216 |
| 29 | -143 |
| 30 | 995085 |
| 31 | -178319232 |
| 32 | 5250000000 |
| 33 | -46986328125 |
| 34 | 163899057231 |
| 35 | -236126248960 |