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 | 2 |
| 2 | 4 |
| 3 | -6 |
| 4 | 8 |
| 5 | -36 |
| 6 | 24 |
| 7 | 16 |
| 8 | -144 |
| 9 | 300 |
| 10 | -120 |
| 11 | 32 |
| 12 | -480 |
| 13 | 2040 |
| 14 | -2640 |
| 15 | 720 |
| 16 | 64 |
| 17 | -1440 |
| 18 | 10320 |
| 19 | -27720 |
| 20 | 25200 |
| 21 | -5040 |
| 22 | 128 |
| 23 | -4032 |
| 24 | 43680 |
| 25 | -199920 |
| 26 | 383040 |
| 27 | -262080 |
| 28 | 40320 |
| 29 | 256 |
| 30 | -10752 |
| 31 | 163968 |
| 32 | -1142400 |
| 33 | 3764880 |
| 34 | -5503680 |
| 35 | 2963520 |
| 36 | -362880 |