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 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 32 |
| 5 | 152 |
| 6 | 872 |
| 7 | 5912 |
| 8 | 46232 |
| 9 | 409112 |
| 10 | 4037912 |
| 11 | 43954712 |
| 12 | 522956312 |
| 13 | 6749977112 |
| 14 | 93928268312 |
| 15 | 1401602636312 |
| 16 | 22324392524312 |
| 17 | 378011820620312 |
| 18 | 6780385526348312 |
| 19 | 128425485935180312 |
| 20 | 2561327494111820312 |