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 | 8 |
| 3 | 54 |
| 4 | 288 |
| 5 | 6250 |
| 6 | 187128 |
| 7 | 1647086 |
| 8 | 16781440 |
| 9 | 387421947 |
| 10 | 40000200200 |
| 11 | 570623341222 |
| 12 | 26748313313184 |
| 13 | 605750213184506 |
| 14 | 44448027513059464 |
| 15 | 1751575561524963000 |
| 16 | 18446744078004584960 |
| 17 | 1654480523772673528354 |
| 18 | 118039224226088108077848 |
| 19 | 3956839311320627178247958 |