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 | 0 |
| 5 | 1 |
| 6 | 0 |
| 7 | -9 |
| 8 | -8 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 0 |
| 13 | 0 |
| 14 | 0 |
| 15 | 0 |
| 16 | -8 |
| 17 | 9 |
| 18 | 14 |
| 19 | -71 |
| 20 | -310 |
| 21 | 281 |
| 22 | 2000 |
| 23 | -8004 |
| 24 | -9200 |
| 25 | 8836 |
| 26 | 720 |
| 27 | -409 |
| 28 | -2710 |
| 29 | 67766 |
| 30 | 110501 |
| 31 | -1117396 |
| 32 | -4130160 |
| 33 | 381136 |
| 34 | 91920 |
| 35 | -111376 |
| 36 | -36080 |
| 37 | 144420 |
| 38 | 555581 |
| 39 | -311814 |
| 40 | -1831958 |
| 41 | 1876689 |
| 42 | -1648 |
| 43 | -3584425 |
| 44 | 4768308 |
| 45 | 1971637204 |
| 46 | 53664688220 |