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 | 0 |
| 1 | 1 |
| 2 | 7 |
| 3 | 12 |
| 4 | 14 |
| 5 | 49 |
| 6 | 13 |
| 7 | 8 |
| 8 | 596 |
| 9 | -1967 |
| 10 | 4011 |
| 11 | 9764 |
| 12 | -128878 |
| 13 | 664545 |
| 14 | -1837695 |
| 15 | -2388448 |
| 16 | 67004968 |
| 17 | -478198239 |
| 18 | 1994890287 |
| 19 | -1669470404 |
| 20 | -56929813514 |
| 21 | 615188040657 |
| 22 | -3794477505067 |
| 23 | 12028579020088 |
| 24 | 50780206473820 |
| 25 | -1172949397923535 |
| 26 | 10766410530764819 |
| 27 | -61183127006113196 |