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 | -2 |
| 2 | 2 |
| 3 | 2 |
| 4 | -14 |
| 5 | 26 |
| 6 | 34 |
| 7 | -398 |
| 8 | 1210 |
| 9 | 450 |
| 10 | -23406 |
| 11 | 118634 |
| 12 | -166286 |
| 13 | -1983342 |
| 14 | 18159658 |
| 15 | -68002894 |
| 16 | -112926670 |
| 17 | 3497644570 |
| 18 | -24969255550 |
| 19 | 64943618962 |
| 20 | 607880756218 |
| 21 | -9318511004702 |
| 22 | 60525142971954 |
| 23 | -80108659182870 |
| 24 | -3000122066181358 |