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 | 5 |
| 3 | 14 |
| 4 | 43 |
| 5 | 144 |
| 6 | 525 |
| 7 | 2084 |
| 8 | 9005 |
| 9 | 42288 |
| 10 | 215111 |
| 11 | 1179738 |
| 12 | 6937765 |
| 13 | 43504598 |
| 14 | 289356385 |
| 15 | 2031636826 |
| 16 | 14995775647 |
| 17 | 115943399636 |
| 18 | 936138957225 |
| 19 | 7872233481696 |
| 20 | 68788474572625 |
| 21 | 623323010473012 |
| 22 | 5846701373312019 |