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 | 72 |
| 3 | 656 |
| 4 | 5992 |
| 5 | 54768 |
| 6 | 500688 |
| 7 | 4577568 |
| 8 | 41851560 |
| 9 | 382641200 |
| 10 | 3498428272 |
| 11 | 31985610720 |
| 12 | 292439802256 |
| 13 | 2673735097184 |
| 14 | 24445577182368 |
| 15 | 223502416896576 |
| 16 | 2043450657688872 |
| 17 | 18682977401318064 |
| 18 | 170815793235313968 |