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 | 6 |
| 2 | 9 |
| 3 | -12 |
| 4 | -42 |
| 5 | -18 |
| 6 | 36 |
| 7 | 48 |
| 8 | 45 |
| 9 | -12 |
| 10 | -108 |
| 11 | -36 |
| 12 | 84 |
| 13 | 84 |
| 14 | 72 |
| 15 | -72 |
| 16 | -186 |
| 17 | -54 |
| 18 | 36 |
| 19 | 120 |
| 20 | 126 |
| 21 | -96 |
| 22 | -216 |
| 23 | -72 |
| 24 | 180 |
| 25 | 186 |
| 26 | 126 |
| 27 | -12 |
| 28 | -336 |
| 29 | -90 |
| 30 | 216 |
| 31 | 192 |
| 32 | 189 |
| 33 | -144 |
| 34 | -324 |
| 35 | -144 |
| 36 | 84 |
| 37 | 228 |
| 38 | 180 |
| 39 | -168 |
| 40 | -540 |
| 41 | -126 |
| 42 | 288 |
| 43 | 264 |
| 44 | 252 |
| 45 | -72 |
| 46 | -432 |
| 47 | -144 |
| 48 | 372 |
| 49 | 342 |
| 50 | 279 |
| 51 | -216 |