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 | 3 |
| 2 | -4 |
| 3 | 16 |
| 4 | -94 |
| 5 | 740 |
| 6 | -7322 |
| 7 | 87096 |
| 8 | -1209242 |
| 9 | 19190176 |
| 10 | -342623408 |
| 11 | 6797028096 |
| 12 | -148325493672 |
| 13 | 3531032617412 |
| 14 | -91064679012376 |
| 15 | 2529198638215228 |
| 16 | -75262590212948118 |
| 17 | 2388933783463085676 |
| 18 | -80567150574145456164 |
| 19 | 2876970976034496438802 |
| 20 | -108441134639989639371264 |