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 | 1 |
| 4 | -6 |
| 5 | -12 |
| 6 | 1 |
| 7 | 12 |
| 8 | -60 |
| 9 | -120 |
| 10 | 1 |
| 11 | -20 |
| 12 | -180 |
| 13 | 840 |
| 14 | 1680 |
| 15 | 1 |
| 16 | 30 |
| 17 | -420 |
| 18 | -3360 |
| 19 | 15120 |
| 20 | 30240 |
| 21 | 1 |
| 22 | -42 |
| 23 | -840 |
| 24 | 10080 |
| 25 | 75600 |
| 26 | -332640 |
| 27 | -665280 |
| 28 | 1 |
| 29 | 56 |
| 30 | -1512 |
| 31 | -25200 |
| 32 | 277200 |
| 33 | 1995840 |
| 34 | -8648640 |
| 35 | -17297280 |
| 36 | 1 |
| 37 | -72 |
| 38 | -2520 |
| 39 | 55440 |
| 40 | 831600 |
| 41 | -8648640 |
| 42 | -60540480 |
| 43 | 259459200 |
| 44 | 518918400 |
| 45 | 1 |
| 46 | 90 |
| 47 | -3960 |
| 48 | -110880 |