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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | -18 |
| 7 | -54 |
| 8 | -72 |
| 9 | -9 |
| 10 | -63 |
| 11 | 18 |
| 12 | -36 |
| 13 | 27 |
| 14 | 9 |
| 15 | -27 |
| 16 | 18 |
| 17 | -36 |
| 18 | 45 |
| 19 | -9 |
| 20 | 54 |
| 21 | 36 |
| 22 | -18 |
| 23 | 45 |
| 24 | -9 |
| 25 | 18 |
| 26 | 0 |
| 27 | -198 |
| 28 | -594 |
| 29 | -792 |
| 30 | -198 |
| 31 | -594 |
| 32 | 0 |
| 33 | -594 |
| 34 | -792 |
| 35 | -792 |
| 36 | 0 |
| 37 | -594 |
| 38 | -198 |
| 39 | -594 |
| 40 | -198 |
| 41 | -792 |
| 42 | 0 |
| 43 | 0 |
| 44 | -198 |
| 45 | -594 |
| 46 | -792 |
| 47 | 99 |
| 48 | -99 |
| 49 | -495 |