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 | 0 |
| 1 | 3 |
| 2 | 36 |
| 3 | 243 |
| 4 | 1296 |
| 5 | 6075 |
| 6 | 26244 |
| 7 | 107163 |
| 8 | 419904 |
| 9 | 1594323 |
| 10 | 5904900 |
| 11 | 21434787 |
| 12 | 76527504 |
| 13 | 269440587 |
| 14 | 937461924 |
| 15 | 3228504075 |
| 16 | 11019960576 |
| 17 | 37321507107 |
| 18 | 125524238436 |
| 19 | 419576389587 |
| 20 | 1394713760400 |
| 21 | 4613015762523 |
| 22 | 15188432850756 |