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 | 1 |
| 3 | -17 |
| 4 | -299 |
| 5 | 1921 |
| 6 | 451621 |
| 7 | 23016631 |
| 8 | -138672407 |
| 9 | -208026131039 |
| 10 | -31455532865879 |
| 11 | -2214855733827329 |
| 12 | 358045039222582141 |
| 13 | 197933737480453452193 |
| 14 | 51028310360637930765901 |
| 15 | 6769736050165112232649351 |
| 16 | -1644881699523140953828119599 |