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 | 3 |
| 3 | 12 |
| 4 | 64 |
| 5 | 377 |
| 6 | 2432 |
| 7 | 16475 |
| 8 | 116263 |
| 9 | 845105 |
| 10 | 6292069 |
| 11 | 47759392 |
| 12 | 368379006 |
| 13 | 2879998966 |
| 14 | 22777018771 |
| 15 | 181938716422 |
| 16 | 1465972415692 |
| 17 | 11902724768574 |
| 18 | 97299665768397 |
| 19 | 800212617435074 |
| 20 | 6617003142869419 |
| 21 | 54985826573015541 |
| 22 | 458962108485797208 |
| 23 | 3846526994743330075 |