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 | 4 |
| 3 | 12 |
| 4 | 42 |
| 5 | 149 |
| 6 | 543 |
| 7 | 2007 |
| 8 | 7501 |
| 9 | 28265 |
| 10 | 107196 |
| 11 | 408653 |
| 12 | 1564506 |
| 13 | 6010964 |
| 14 | 23164467 |
| 15 | 89501021 |
| 16 | 346588092 |
| 17 | 1344804060 |
| 18 | 5227147969 |
| 19 | 20349230347 |
| 20 | 79330194097 |
| 21 | 309653982738 |
| 22 | 1210071825851 |
| 23 | 4733665388134 |
| 24 | 18535196846866 |