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 | 18 |
| 2 | 345 |
| 3 | 7650 |
| 4 | 196245 |
| 5 | 5755050 |
| 6 | 190482705 |
| 7 | 7034400450 |
| 8 | 286988226525 |
| 9 | 12826061498250 |
| 10 | 623403611055225 |
| 11 | 32747785180560450 |
| 12 | 1849179329801929125 |
| 13 | 111713055889014830250 |
| 14 | 7190273917194645902625 |
| 15 | 491244630824362410245250 |
| 16 | 35508203161436371983742125 |