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 | 6 |
| 1 | 36 |
| 2 | 234 |
| 3 | 1284 |
| 4 | 6804 |
| 5 | 38160 |
| 6 | 198912 |
| 7 | 1070316 |
| 8 | 5499054 |
| 9 | 29005692 |
| 10 | 149318838 |
| 11 | 776570508 |
| 12 | 3987307152 |
| 13 | 20560750344 |
| 14 | 105345948384 |
| 15 | 540305120844 |
| 16 | 2761471319562 |
| 17 | 14111436147228 |
| 18 | 71964766006350 |
| 19 | 366780011157360 |