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 | -3 |
| 4 | -35 |
| 5 | 48 |
| 6 | 693 |
| 7 | -1046 |
| 8 | -16635 |
| 9 | 26328 |
| 10 | 442396 |
| 11 | -720327 |
| 12 | -12541509 |
| 13 | 20810208 |
| 14 | 371430414 |
| 15 | -624691212 |
| 16 | -11356013899 |
| 17 | 19293440712 |
| 18 | 355703260500 |
| 19 | -609103135196 |
| 20 | -11355804637164 |
| 21 | 19568456886336 |
| 22 | 368147199241021 |
| 23 | -637674031240302 |
| 24 | -12087185276792061 |