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 | 5 |
| 4 | 16 |
| 5 | 66 |
| 6 | 348 |
| 7 | 2321 |
| 8 | 19437 |
| 9 | 203554 |
| 10 | 2661035 |
| 11 | 43399794 |
| 12 | 883165898 |
| 13 | 22436796424 |
| 14 | 712153021345 |
| 15 | 28264751131084 |
| 16 | 1403965520612428 |
| 17 | 87352867349503436 |
| 18 | 6813355443494722779 |
| 19 | 666712967112785700169 |