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 | 2 |
| 2 | 4 |
| 3 | 9 |
| 4 | 24 |
| 5 | 78 |
| 6 | 313 |
| 7 | 1557 |
| 8 | 9606 |
| 9 | 73482 |
| 10 | 696736 |
| 11 | 8187149 |
| 12 | 119214337 |
| 13 | 2150935400 |
| 14 | 48085463503 |
| 15 | 1331903411529 |
| 16 | 45708405952786 |
| 17 | 1943464419169294 |
| 18 | 102378212255343442 |
| 19 | 6681679619583450775 |
| 20 | 540264005909352759970 |
| 21 | 54120992439329583459008 |
| 22 | 6716802027097934788929023 |