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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | -2 |
| 6 | 0 |
| 7 | 0 |
| 8 | -2 |
| 9 | 0 |
| 10 | -2 |
| 11 | 0 |
| 12 | -6 |
| 13 | 6 |
| 14 | 0 |
| 15 | 6 |
| 16 | 44 |
| 17 | 26 |
| 18 | -20 |
| 19 | -48 |
| 20 | 52 |
| 21 | 58 |
| 22 | 104 |
| 23 | -82 |
| 24 | -250 |
| 25 | -270 |
| 26 | -474 |
| 27 | -1864 |
| 28 | -3094 |
| 29 | -4588 |
| 30 | -2534 |
| 31 | -7574 |
| 32 | -1522 |
| 33 | 1818 |
| 34 | 9264 |
| 35 | 18082 |
| 36 | 8898 |
| 37 | -30500 |
| 38 | -20586 |
| 39 | -3232 |
| 40 | -90522 |
| 41 | -127446 |
| 42 | -231384 |
| 43 | -83574 |
| 44 | -87364 |
| 45 | 267886 |