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 | 8 |
| 2 | 88 |
| 3 | 1232 |
| 4 | 20944 |
| 5 | 418880 |
| 6 | 9634240 |
| 7 | 250490240 |
| 8 | 7264216960 |
| 9 | 232454942720 |
| 10 | 8135922995200 |
| 11 | 309165073817600 |
| 12 | 12675768026521600 |
| 13 | 557733793166950400 |
| 14 | 26213488278846668800 |
| 15 | 1310674413942333440000 |
| 16 | 69465743938943672320000 |
| 17 | 3890081660580845649920000 |