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 | -2 |
| 4 | -9 |
| 5 | -9 |
| 6 | 3 |
| 7 | 18 |
| 8 | 18 |
| 9 | -4 |
| 10 | -30 |
| 11 | -30 |
| 12 | 5 |
| 13 | 45 |
| 14 | 45 |
| 15 | -6 |
| 16 | -63 |
| 17 | -63 |
| 18 | 7 |
| 19 | 84 |
| 20 | 84 |
| 21 | -8 |
| 22 | -108 |
| 23 | -108 |
| 24 | 9 |
| 25 | 135 |
| 26 | 135 |
| 27 | -10 |
| 28 | -165 |
| 29 | -165 |
| 30 | 11 |
| 31 | 198 |
| 32 | 198 |
| 33 | -12 |
| 34 | -234 |
| 35 | -234 |
| 36 | 13 |
| 37 | 273 |
| 38 | 273 |
| 39 | -14 |
| 40 | -315 |
| 41 | -315 |
| 42 | 15 |
| 43 | 360 |
| 44 | 360 |
| 45 | -16 |
| 46 | -408 |
| 47 | -408 |
| 48 | 17 |
| 49 | 459 |
| 50 | 459 |