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 | -18 |
| 2 | 135 |
| 3 | -510 |
| 4 | 765 |
| 5 | 1242 |
| 6 | -7038 |
| 7 | 8280 |
| 8 | 9180 |
| 9 | -27710 |
| 10 | 3519 |
| 11 | 20196 |
| 12 | 50370 |
| 13 | -68850 |
| 14 | -153765 |
| 15 | 244782 |
| 16 | 52785 |
| 17 | -71010 |
| 18 | -130525 |
| 19 | -343620 |
| 20 | 517293 |
| 21 | 54978 |
| 22 | 498780 |
| 23 | -390150 |
| 24 | -1835865 |
| 25 | 1161270 |
| 26 | 896751 |
| 27 | 793730 |
| 28 | -633420 |