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 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 0 |
| 7 | -4 |
| 8 | 3 |
| 9 | 1 |
| 10 | 0 |
| 11 | 6 |
| 12 | -13 |
| 13 | 6 |
| 14 | 1 |
| 15 | 0 |
| 16 | 24 |
| 17 | -10 |
| 18 | -25 |
| 19 | 10 |
| 20 | 1 |
| 21 | 0 |
| 22 | -240 |
| 23 | 394 |
| 24 | -135 |
| 25 | -35 |
| 26 | 15 |
| 27 | 1 |
| 28 | 0 |
| 29 | 720 |
| 30 | -2016 |
| 31 | 1834 |
| 32 | -525 |
| 33 | -35 |
| 34 | 21 |
| 35 | 1 |
| 36 | 0 |
| 37 | 5040 |
| 38 | -5076 |
| 39 | -3668 |
| 40 | 5089 |
| 41 | -1400 |
| 42 | -14 |
| 43 | 28 |
| 44 | 1 |
| 45 | 0 |
| 46 | -80640 |
| 47 | 170064 |
| 48 | -110692 |
| 49 | 14364 |
| 50 | 9849 |
| 51 | -3024 |
| 52 | 42 |
| 53 | 36 |
| 54 | 1 |
| 55 | 0 |
| 56 | 362880 |
| 57 | -1155024 |
| 58 | 1339020 |
| 59 | -672400 |
| 60 | 118125 |
| 61 | 12873 |
| 62 | -5670 |
| 63 | 150 |
| 64 | 45 |
| 65 | 1 |