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 | 54 |
| 1 | 144 |
| 2 | 900 |
| 3 | 2916 |
| 4 | 14112 |
| 5 | 59616 |
| 6 | 280908 |
| 7 | 1304100 |
| 8 | 5974254 |
| 9 | 28501416 |
| 10 | 133160508 |
| 11 | 641771424 |
| 12 | 3037720320 |
| 13 | 14671207872 |
| 14 | 70242548778 |
| 15 | 340125653664 |
| 16 | 1640652533460 |
| 17 | 7963315328520 |
| 18 | 38614602921930 |