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 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 1 |
| 7 | 1 |
| 8 | 0 |
| 9 | 6 |
| 10 | 1 |
| 11 | 1 |
| 12 | -2 |
| 13 | -3 |
| 14 | 24 |
| 15 | 1 |
| 16 | 1 |
| 17 | -4 |
| 18 | -6 |
| 19 | -4 |
| 20 | 120 |
| 21 | 1 |
| 22 | 1 |
| 23 | -6 |
| 24 | -3 |
| 25 | 40 |
| 26 | 25 |
| 27 | 720 |
| 28 | 1 |
| 29 | 1 |
| 30 | -8 |
| 31 | 6 |
| 32 | 132 |
| 33 | 120 |
| 34 | 114 |
| 35 | 5040 |
| 36 | 1 |
| 37 | 1 |
| 38 | -10 |
| 39 | 21 |
| 40 | 248 |
| 41 | -375 |
| 42 | -1872 |
| 43 | -287 |
| 44 | 40320 |
| 45 | 1 |
| 46 | 1 |
| 47 | -12 |
| 48 | 42 |
| 49 | 364 |
| 50 | -2120 |
| 51 | -8298 |
| 52 | -3920 |
| 53 | -4152 |
| 54 | 362880 |
| 55 | 1 |
| 56 | 1 |
| 57 | -14 |
| 58 | 69 |
| 59 | 456 |
| 60 | -5655 |
| 61 | -12144 |
| 62 | 86121 |
| 63 | 155776 |
| 64 | -1647 |
| 65 | 3628800 |