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 | -5 |
| 2 | 5 |
| 3 | 115 |
| 4 | -95 |
| 5 | -8245 |
| 6 | -21275 |
| 7 | 896275 |
| 8 | 8801825 |
| 9 | -95466725 |
| 10 | -2703832475 |
| 11 | -3522650125 |
| 12 | 717727962625 |
| 13 | 9961465952875 |
| 14 | -118944021914875 |
| 15 | -5634631318806125 |
| 16 | -37511809003469375 |
| 17 | 2020875725751906875 |
| 18 | 55489065505990733125 |
| 19 | -65182838564153418125 |