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 | 6 |
| 2 | 36 |
| 3 | 216 |
| 4 | 1290 |
| 5 | 7680 |
| 6 | 45600 |
| 7 | 270150 |
| 8 | 1597500 |
| 9 | 9432000 |
| 10 | 55616250 |
| 11 | 327585000 |
| 12 | 1927725000 |
| 13 | 11335143750 |
| 14 | 66607312500 |
| 15 | 391177125000 |
| 16 | 2296246406250 |
| 17 | 13473738750000 |
| 18 | 79033031250000 |
| 19 | 463449377343750 |
| 20 | 2716989679687500 |