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 | 0 |
| 2 | -3 |
| 3 | 136 |
| 4 | 3585 |
| 5 | -8065624 |
| 6 | 985282165 |
| 7 | 102324513620736 |
| 8 | -758462117693095935 |
| 9 | -310124007268556369914448 |
| 10 | 59000420766060452235999162501 |
| 11 | 231739512209034254162941881236647760 |
| 12 | -948238573709799908746228205852168505192191 |
| 13 | -43263440520748047736633474769642007589423961473152 |