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 | -2 |
| 2 | -13 |
| 3 | 60 |
| 4 | 1113 |
| 5 | 1002 |
| 6 | -149049 |
| 7 | -1932696 |
| 8 | 7188705 |
| 9 | 676972566 |
| 10 | 10821753819 |
| 11 | -32865363468 |
| 12 | -5892948042327 |
| 13 | -144308265498270 |
| 14 | -748826955982593 |
| 15 | 74472859430936928 |
| 16 | 3199088479682040129 |
| 17 | 57854159449349840046 |
| 18 | -654712764990637945725 |
| 19 | -87482030500940669619156 |