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 | 1 |
| 2 | -1 |
| 3 | 1 |
| 4 | 2 |
| 5 | -3 |
| 6 | 1 |
| 7 | -5 |
| 8 | 11 |
| 9 | -6 |
| 10 | 1 |
| 11 | 10 |
| 12 | -45 |
| 13 | 35 |
| 14 | -10 |
| 15 | 1 |
| 16 | 35 |
| 17 | 175 |
| 18 | -210 |
| 19 | 85 |
| 20 | -15 |
| 21 | 1 |
| 22 | -910 |
| 23 | -315 |
| 24 | 1225 |
| 25 | -700 |
| 26 | 175 |
| 27 | -21 |
| 28 | 1 |
| 29 | 11935 |
| 30 | -6265 |
| 31 | -5670 |
| 32 | 5565 |
| 33 | -1890 |
| 34 | 322 |
| 35 | -28 |
| 36 | 1 |
| 37 | -134750 |
| 38 | 139755 |
| 39 | -5005 |
| 40 | -39270 |
| 41 | 19425 |
| 42 | -4410 |
| 43 | 546 |
| 44 | -36 |
| 45 | 1 |
| 46 | 1376375 |
| 47 | -2127125 |