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 | 3 |
| 1 | 6 |
| 2 | 27 |
| 3 | 150 |
| 4 | 867 |
| 5 | 5046 |
| 6 | 29403 |
| 7 | 171366 |
| 8 | 998787 |
| 9 | 5821350 |
| 10 | 33929307 |
| 11 | 197754486 |
| 12 | 1152597603 |
| 13 | 6717831126 |
| 14 | 39154389147 |
| 15 | 228208503750 |
| 16 | 1330096633347 |
| 17 | 7752371296326 |
| 18 | 45184131144603 |
| 19 | 263352415571286 |
| 20 | 1534930362283107 |
| 21 | 8946229758127350 |
| 22 | 52142448186480987 |
| 23 | 303908459360758566 |
| 24 | 1771308307978070403 |