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 | 2 |
| 3 | -3 |
| 4 | -4 |
| 5 | 4 |
| 6 | 11 |
| 7 | -18 |
| 8 | -12 |
| 9 | 8 |
| 10 | 57 |
| 11 | 88 |
| 12 | -72 |
| 13 | -32 |
| 14 | 16 |
| 15 | -361 |
| 16 | 570 |
| 17 | 440 |
| 18 | -240 |
| 19 | -80 |
| 20 | 32 |
| 21 | -2763 |
| 22 | -4332 |
| 23 | 3420 |
| 24 | 1760 |
| 25 | -720 |
| 26 | -192 |
| 27 | 64 |
| 28 | 24611 |
| 29 | -38682 |
| 30 | -30324 |
| 31 | 15960 |
| 32 | 6160 |
| 33 | -2016 |
| 34 | -448 |
| 35 | 128 |
| 36 | 250737 |
| 37 | 393776 |
| 38 | -309456 |
| 39 | -161728 |
| 40 | 63840 |
| 41 | 19712 |
| 42 | -5376 |
| 43 | -1024 |
| 44 | 256 |