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 | 1 |
| 2 | 4 |
| 3 | 27 |
| 4 | 216 |
| 5 | 1875 |
| 6 | 17088 |
| 7 | 160867 |
| 8 | 1549936 |
| 9 | 15195843 |
| 10 | 151017780 |
| 11 | 1517232189 |
| 12 | 15379549056 |
| 13 | 157058738343 |
| 14 | 1614039427224 |
| 15 | 16676755365555 |
| 16 | 173118505001952 |
| 17 | 1804500885273123 |
| 18 | 18877476988765404 |
| 19 | 198120856336103017 |
| 20 | 2085303730716475960 |