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 | 40 |
| 6 | 3306 |
| 7 | 131876 |
| 8 | 3961356 |
| 9 | 103290096 |
| 10 | 2488179582 |
| 11 | 57162274972 |
| 12 | 1274774473632 |
| 13 | 27887396866472 |
| 14 | 602352276704178 |
| 15 | 12899161619186388 |
| 16 | 274612697648135028 |
| 17 | 5822592730060070368 |
| 18 | 123107330974129584294 |