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 | 0 |
| 1 | 10 |
| 2 | 7936 |
| 3 | 413343 |
| 4 | 6946816 |
| 5 | 62500000 |
| 6 | 377913600 |
| 7 | 1735205101 |
| 8 | 6509559808 |
| 9 | 20920706406 |
| 10 | 59500000000 |
| 11 | 153266599915 |
| 12 | 363764514816 |
| 13 | 805941952348 |
| 14 | 1683875312896 |
| 15 | 3344572265625 |
| 16 | 6356551598080 |
| 17 | 11621611896706 |
| 18 | 20530186553088 |
| 19 | 35172959057911 |
| 20 | 58624000000000 |