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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | 9 |
| 7 | 27 |
| 8 | 81 |
| 9 | 189 |
| 10 | 441 |
| 11 | 1029 |
| 12 | 2401 |
| 13 | 5145 |
| 14 | 11025 |
| 15 | 23625 |
| 16 | 50625 |
| 17 | 104625 |
| 18 | 216225 |
| 19 | 446865 |
| 20 | 923521 |
| 21 | 1876833 |
| 22 | 3814209 |
| 23 | 7751457 |
| 24 | 15752961 |
| 25 | 31755969 |
| 26 | 64016001 |
| 27 | 129048129 |
| 28 | 260144641 |
| 29 | 522337665 |
| 30 | 1048788225 |
| 31 | 2105834625 |
| 32 | 4228250625 |
| 33 | 8473082625 |
| 34 | 16979393025 |
| 35 | 34025371905 |
| 36 | 68184176641 |