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 | -31 |
| 3 | -274 |
| 4 | -274 |
| 5 | -3399 |
| 6 | 4377 |
| 7 | -12430 |
| 8 | -12430 |
| 9 | -12430 |
| 10 | 87570 |
| 11 | -73481 |
| 12 | -73481 |
| 13 | -444774 |
| 14 | 93050 |
| 15 | 852425 |
| 16 | 852425 |
| 17 | -567432 |
| 18 | -567432 |
| 19 | -3043531 |
| 20 | -3043531 |
| 21 | 1040570 |
| 22 | 6194202 |
| 23 | -242141 |
| 24 | -242141 |
| 25 | -242141 |
| 26 | 11639235 |
| 27 | 11639235 |
| 28 | 11639235 |
| 29 | -8871914 |
| 30 | -33171914 |
| 31 | -61801065 |