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 | -3 |
| 2 | 3 |
| 3 | -4 |
| 4 | 9 |
| 5 | -12 |
| 6 | 15 |
| 7 | -21 |
| 8 | 30 |
| 9 | -43 |
| 10 | 54 |
| 11 | -69 |
| 12 | 94 |
| 13 | -123 |
| 14 | 153 |
| 15 | -193 |
| 16 | 252 |
| 17 | -318 |
| 18 | 391 |
| 19 | -486 |
| 20 | 609 |
| 21 | -754 |
| 22 | 918 |
| 23 | -1119 |
| 24 | 1376 |
| 25 | -1680 |
| 26 | 2019 |
| 27 | -2432 |
| 28 | 2946 |
| 29 | -3540 |
| 30 | 4220 |
| 31 | -5034 |
| 32 | 6015 |
| 33 | -7157 |
| 34 | 8463 |
| 35 | -9999 |
| 36 | 11835 |
| 37 | -13956 |
| 38 | 16374 |
| 39 | -19206 |
| 40 | 22542 |
| 41 | -26376 |
| 42 | 30750 |
| 43 | -35829 |
| 44 | 41745 |