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 | 1 |
| 4 | -4 |
| 5 | 10 |
| 6 | -19 |
| 7 | 35 |
| 8 | -60 |
| 9 | 85 |
| 10 | -110 |
| 11 | 165 |
| 12 | -243 |
| 13 | 286 |
| 14 | -329 |
| 15 | 466 |
| 16 | -620 |
| 17 | 680 |
| 18 | -751 |
| 19 | 969 |
| 20 | -1254 |
| 21 | 1366 |
| 22 | -1375 |
| 23 | 1771 |
| 24 | -2323 |
| 25 | 2310 |
| 26 | -2314 |
| 27 | 3010 |
| 28 | -3609 |
| 29 | 3654 |
| 30 | -3734 |
| 31 | 4495 |
| 32 | -5580 |
| 33 | 5622 |
| 34 | -5304 |
| 35 | 6590 |
| 36 | -8115 |
| 37 | 7770 |
| 38 | -7467 |
| 39 | 9426 |
| 40 | -11190 |
| 41 | 10660 |
| 42 | -10498 |
| 43 | 12341 |
| 44 | -14623 |
| 45 | 14740 |
| 46 | -13409 |
| 47 | 16215 |
| 48 | -20179 |
| 49 | 18459 |
| 50 | -17410 |
| 51 | 21506 |