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 | 32 |
| 2 | 212 |
| 3 | 1428 |
| 4 | 9676 |
| 5 | 65800 |
| 6 | 448524 |
| 7 | 3062596 |
| 8 | 20939104 |
| 9 | 143307908 |
| 10 | 981612296 |
| 11 | 6728277248 |
| 12 | 46143758054 |
| 13 | 316613006372 |
| 14 | 2173302900418 |
| 15 | 14923204166476 |
| 16 | 102502175850752 |
| 17 | 704231575697316 |
| 18 | 4839430076086740 |
| 19 | 33262613275263868 |