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 | -5 |
| 2 | 11 |
| 3 | -10 |
| 4 | 133 |
| 5 | -10 |
| 6 | 131 |
| 7 | -70 |
| 8 | 1333 |
| 9 | 782 |
| 10 | -48545 |
| 11 | -20350 |
| 12 | 61236703 |
| 13 | 722774 |
| 14 | -5580043 |
| 15 | -34607350 |
| 16 | 25950004661 |
| 17 | 2145998366 |
| 18 | -2832495728863 |
| 19 | -167317266670 |
| 20 | 101471818426463 |
| 21 | 16020403321958 |
| 22 | -4469253897847277 |
| 23 | -1848020950359910 |
| 24 | 11126033443529034103 |
| 25 | 252778977216699950 |