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 | 1056 |
| 5 | 5004 |
| 6 | 22110 |
| 7 | 94554 |
| 8 | 391314 |
| 9 | 1582824 |
| 10 | 6278400 |
| 11 | 24520080 |
| 12 | 94523100 |
| 13 | 360449622 |
| 14 | 1361930880 |
| 15 | 5105718624 |
| 16 | 19011717024 |
| 17 | 70378031196 |
| 18 | 259193957658 |
| 19 | 950281765146 |
| 20 | 3470120581542 |
| 21 | 12626754295920 |
| 22 | 45799000309176 |