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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 256 |
| 6 | 15381 |
| 7 | 815867 |
| 8 | 47818683 |
| 9 | 3291232419 |
| 10 | 270038320842 |
| 11 | 26366544332292 |
| 12 | 3038643940889754 |
| 13 | 409107090075310746 |
| 14 | 63681176297547793493 |
| 15 | 11350054578585382645977 |
| 16 | 2296208875599834678215827 |
| 17 | 523217007018082627351544259 |
| 18 | 133356820608541419593405364486 |