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 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 4 |
| 5 | 8 |
| 6 | 24 |
| 7 | 32 |
| 8 | 40 |
| 9 | 120 |
| 10 | 296 |
| 11 | 648 |
| 12 | 1328 |
| 13 | 3200 |
| 14 | 9912 |
| 15 | 25592 |
| 16 | 55920 |
| 17 | 143192 |
| 18 | 510696 |
| 19 | 1451296 |
| 20 | 3497344 |
| 21 | 10451824 |
| 22 | 38570704 |
| 23 | 118914992 |
| 24 | 315235872 |
| 25 | 1014824752 |
| 26 | 3963684496 |
| 27 | 13166130152 |
| 28 | 37846301904 |
| 29 | 130507967088 |
| 30 | 533318630936 |
| 31 | 1884550215976 |
| 32 | 5800121391936 |