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 | -3 |
| 5 | 1 |
| 6 | -7 |
| 7 | 12 |
| 8 | -6 |
| 9 | 1 |
| 10 | 41 |
| 11 | -73 |
| 12 | 41 |
| 13 | -10 |
| 14 | 1 |
| 15 | -376 |
| 16 | 675 |
| 17 | -390 |
| 18 | 105 |
| 19 | -15 |
| 20 | 1 |
| 21 | 5033 |
| 22 | -9048 |
| 23 | 5256 |
| 24 | -1446 |
| 25 | 225 |
| 26 | -21 |
| 27 | 1 |
| 28 | -92821 |
| 29 | 166901 |
| 30 | -97034 |
| 31 | 26796 |
| 32 | -4242 |
| 33 | 427 |
| 34 | -28 |
| 35 | 1 |
| 36 | 2257166 |
| 37 | -4058703 |
| 38 | 2359939 |
| 39 | -652054 |
| 40 | 103515 |
| 41 | -10570 |
| 42 | 742 |
| 43 | -36 |
| 44 | 1 |
| 45 | -69981919 |
| 46 | 125837748 |
| 47 | -73169550 |
| 48 | 20218251 |
| 49 | -3210939 |