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 | 18 |
| 2 | 324 |
| 3 | 612 |
| 4 | 1156 |
| 5 | 4216 |
| 6 | 15376 |
| 7 | 50096 |
| 8 | 163216 |
| 9 | 578528 |
| 10 | 2050624 |
| 11 | 6804864 |
| 12 | 22581504 |
| 13 | 79225344 |
| 14 | 277955584 |
| 15 | 930264256 |
| 16 | 3113416804 |
| 17 | 10855054516 |
| 18 | 37846589764 |
| 19 | 127345247780 |
| 20 | 428488068100 |
| 21 | 1487399982580 |
| 22 | 5163174596644 |
| 23 | 17438992794736 |