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 | 4 |
| 2 | -12 |
| 3 | -76 |
| 4 | 116 |
| 5 | 1332 |
| 6 | -524 |
| 7 | -21836 |
| 8 | -13452 |
| 9 | 335924 |
| 10 | 551156 |
| 11 | -4823628 |
| 12 | -13642124 |
| 13 | 63535924 |
| 14 | 281809908 |
| 15 | -734764876 |
| 16 | -5243723404 |
| 17 | 6512514612 |
| 18 | 90412089076 |
| 19 | -13788144716 |
| 20 | -1460381569932 |
| 21 | -1239771254476 |
| 22 | 22126333864436 |
| 23 | 41962673936052 |