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 | 3 |
| 6 | 0 |
| 7 | 1 |
| 8 | -6 |
| 9 | 16 |
| 10 | 0 |
| 11 | -1 |
| 12 | 12 |
| 13 | -48 |
| 14 | 125 |
| 15 | 0 |
| 16 | 1 |
| 17 | -24 |
| 18 | 144 |
| 19 | -500 |
| 20 | 1296 |
| 21 | 0 |
| 22 | -1 |
| 23 | 48 |
| 24 | -432 |
| 25 | 2000 |
| 26 | -6480 |
| 27 | 16807 |
| 28 | 0 |
| 29 | 1 |
| 30 | -96 |
| 31 | 1296 |
| 32 | -8000 |
| 33 | 32400 |
| 34 | -100842 |
| 35 | 262144 |
| 36 | 0 |
| 37 | -1 |
| 38 | 192 |
| 39 | -3888 |
| 40 | 32000 |
| 41 | -162000 |
| 42 | 605052 |
| 43 | -1835008 |
| 44 | 4782969 |
| 45 | 0 |
| 46 | 1 |
| 47 | -384 |
| 48 | 11664 |
| 49 | -128000 |
| 50 | 810000 |
| 51 | -3630312 |
| 52 | 12845056 |
| 53 | -38263752 |
| 54 | 100000000 |