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 | -3 |
| 3 | -10 |
| 4 | 17 |
| 5 | 249 |
| 6 | 541 |
| 7 | -19520 |
| 8 | -234261 |
| 9 | 4081751 |
| 10 | 157040423 |
| 11 | -675903030 |
| 12 | -304046407637 |
| 13 | -11362045786001 |
| 14 | 1814897653228119 |
| 15 | 243414885066104960 |
| 16 | -23403892390201032679 |
| 17 | -11906020446293954889999 |