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 | 4 |
| 2 | -14 |
| 3 | 32 |
| 4 | 6 |
| 5 | -220 |
| 6 | 794 |
| 7 | -1528 |
| 8 | 1038 |
| 9 | 4428 |
| 10 | -19998 |
| 11 | 44528 |
| 12 | -49770 |
| 13 | -48908 |
| 14 | 391210 |
| 15 | -1033384 |
| 16 | 1520286 |
| 17 | -160228 |
| 18 | -6341134 |
| 19 | 20818496 |
| 20 | -37590234 |
| 21 | 26378436 |
| 22 | 82578234 |
| 23 | -374832472 |
| 24 | 813526830 |
| 25 | -912940820 |
| 26 | -677582846 |
| 27 | 6058167440 |
| 28 | -15935945034 |
| 29 | 23495866004 |
| 30 | -4618822582 |
| 31 | -86184783880 |