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 | 1 |
| 2 | -124 |
| 3 | -2179 |
| 4 | -16368 |
| 5 | -78093 |
| 6 | -279872 |
| 7 | -823415 |
| 8 | -2096896 |
| 9 | -4782457 |
| 10 | -9998976 |
| 11 | -19485123 |
| 12 | -35827712 |
| 13 | -62740325 |
| 14 | -105397120 |
| 15 | -170826607 |
| 16 | -268369920 |
| 17 | -410207601 |
| 18 | -611957888 |
| 19 | -893347451 |
| 20 | -1278951424 |
| 21 | -1798991389 |
| 22 | -2490163584 |
| 23 | -3396436839 |