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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 776216 |
| 7 | 18130188 |
| 8 | 5550332508 |
| 9 | 1251282702264 |
| 10 | 166071600559137 |
| 11 | 13047136918828740 |
| 12 | 629048543890724224 |
| 13 | 19087130695796613120 |
| 14 | 372099690249351069696 |
| 15 | 4739291519495550533632 |