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 | -1 |
| 2 | 10 |
| 3 | -20 |
| 4 | 38 |
| 5 | -57 |
| 6 | 84 |
| 7 | -112 |
| 8 | 148 |
| 9 | -185 |
| 10 | 230 |
| 11 | -276 |
| 12 | 330 |
| 13 | -385 |
| 14 | 448 |
| 15 | -512 |
| 16 | 584 |
| 17 | -657 |
| 18 | 738 |
| 19 | -820 |
| 20 | 910 |
| 21 | -1001 |
| 22 | 1100 |
| 23 | -1200 |
| 24 | 1308 |
| 25 | -1417 |
| 26 | 1534 |
| 27 | -1652 |
| 28 | 1778 |
| 29 | -1905 |
| 30 | 2040 |
| 31 | -2176 |
| 32 | 2320 |
| 33 | -2465 |
| 34 | 2618 |
| 35 | -2772 |
| 36 | 2934 |
| 37 | -3097 |
| 38 | 3268 |
| 39 | -3440 |
| 40 | 3620 |
| 41 | -3801 |
| 42 | 3990 |
| 43 | -4180 |