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 | 1 |
| 2 | -2 |
| 3 | -1 |
| 4 | -6 |
| 5 | 0 |
| 6 | 10 |
| 7 | 16 |
| 8 | 4 |
| 9 | -11 |
| 10 | -17 |
| 11 | -12 |
| 12 | -5 |
| 13 | -1 |
| 14 | -24 |
| 15 | 84 |
| 16 | -60 |
| 17 | 30 |
| 18 | -144 |
| 19 | -48 |
| 20 | 104 |
| 21 | 186 |
| 22 | 268 |
| 23 | -12 |
| 24 | -240 |
| 25 | -436 |
| 26 | -348 |
| 27 | -46 |
| 28 | 262 |
| 29 | 444 |
| 30 | 391 |
| 31 | 199 |
| 32 | -23 |
| 33 | -166 |
| 34 | -207 |
| 35 | -172 |
| 36 | -109 |
| 37 | -55 |
| 38 | -21 |
| 39 | -6 |
| 40 | -1 |
| 41 | 120 |
| 42 | -1200 |
| 43 | 4560 |
| 44 | -7740 |
| 45 | 5064 |
| 46 | -2472 |
| 47 | 9768 |
| 48 | -19152 |
| 49 | 35004 |
| 50 | -39408 |