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 | -2 |
| 3 | -14 |
| 4 | -94 |
| 5 | -288 |
| 6 | -530 |
| 7 | -842 |
| 8 | -3884 |
| 9 | -25216 |
| 10 | -116026 |
| 11 | -342224 |
| 12 | -522626 |
| 13 | -966578 |
| 14 | -7424752 |
| 15 | -29445104 |
| 16 | -97617938 |
| 17 | -271676470 |
| 18 | -618117940 |
| 19 | -810056106 |
| 20 | -6260758462 |
| 21 | -34541748676 |