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 | 0 |
| 1 | 1 |
| 2 | 0 |
| 3 | -6 |
| 4 | 8 |
| 5 | 0 |
| 6 | 142 |
| 7 | -48 |
| 8 | 64 |
| 9 | 0 |
| 10 | 31800 |
| 11 | 1136 |
| 12 | -384 |
| 13 | 512 |
| 14 | 0 |
| 15 | -159468264 |
| 16 | 254400 |
| 17 | 9088 |
| 18 | -3072 |
| 19 | 4096 |
| 20 | 0 |
| 21 | -2481298801008 |
| 22 | -1275746112 |
| 23 | 2035200 |
| 24 | 72704 |
| 25 | -24576 |
| 26 | 32768 |
| 27 | 0 |
| 28 | 1414130111428687344 |
| 29 | -19850390408064 |
| 30 | -10205968896 |
| 31 | 16281600 |
| 32 | 581632 |
| 33 | -196608 |
| 34 | 262144 |
| 35 | 0 |