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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 8 |
| 4 | 0 |
| 5 | 1024 |
| 6 | 0 |
| 7 | 279936 |
| 8 | 0 |
| 9 | 512 |
| 10 | 59049 |
| 11 | 100000000000 |
| 12 | 0 |
| 13 | 106993205379072 |
| 14 | 0 |
| 15 | 155568095557812224 |
| 16 | 0 |
| 17 | 295147905179352825856 |
| 18 | 0 |
| 19 | 708235345355337676357632 |
| 20 | 0 |
| 21 | 476837158203125 |
| 22 | 0 |
| 23 | 7511413302012830262726227918848 |
| 24 | 0 |
| 25 | 1125899906842624 |