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 | 1293 |
| 5 | 7712 |
| 6 | 45866 |
| 7 | 272760 |
| 8 | 1621963 |
| 9 | 9644496 |
| 10 | 57346376 |
| 11 | 340979312 |
| 12 | 2027446948 |
| 13 | 12055094608 |
| 14 | 71678940042 |
| 15 | 426199029864 |
| 16 | 2534155836542 |
| 17 | 15067950109140 |
| 18 | 89593195408640 |
| 19 | 532716168060704 |
| 20 | 3167500770096043 |