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 | 1 |
| 2 | 1 |
| 3 | -2 |
| 4 | 1 |
| 5 | -4 |
| 6 | 2 |
| 7 | 1 |
| 8 | -6 |
| 9 | 8 |
| 10 | 1 |
| 11 | -8 |
| 12 | 18 |
| 13 | -8 |
| 14 | 1 |
| 15 | -10 |
| 16 | 32 |
| 17 | -32 |
| 18 | 4 |
| 19 | 1 |
| 20 | -12 |
| 21 | 50 |
| 22 | -80 |
| 23 | 36 |
| 24 | 1 |
| 25 | -14 |
| 26 | 72 |
| 27 | -160 |
| 28 | 136 |
| 29 | -24 |
| 30 | 1 |
| 31 | -16 |
| 32 | 98 |
| 33 | -280 |
| 34 | 360 |
| 35 | -160 |
| 36 | 8 |
| 37 | 1 |
| 38 | -18 |
| 39 | 128 |
| 40 | -448 |
| 41 | 780 |
| 42 | -592 |
| 43 | 128 |
| 44 | 1 |
| 45 | -20 |
| 46 | 162 |
| 47 | -672 |
| 48 | 1484 |
| 49 | -1632 |
| 50 | 720 |
| 51 | -64 |