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 | 789696 |
| 5 | 10664384 |
| 6 | 48391584 |
| 7 | 132995984 |
| 8 | 276318288 |
| 9 | 482853584 |
| 10 | 752575536 |
| 11 | 1083942480 |
| 12 | 1475455440 |
| 13 | 1926184124 |
| 14 | 2435663832 |
| 15 | 3003713808 |
| 16 | 3630272848 |
| 17 | 4315325376 |
| 18 | 5058867816 |
| 19 | 5860899668 |
| 20 | 6721420864 |
| 21 | 7640431404 |
| 22 | 8617931288 |