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) |
|---|---|
| 1 | 28 |
| 2 | 784 |
| 3 | 2654 |
| 4 | 11509 |
| 5 | 59252 |
| 6 | 235872 |
| 7 | 887114 |
| 8 | 3488718 |
| 9 | 13324700 |
| 10 | 49528948 |
| 11 | 184808314 |
| 12 | 687726602 |
| 13 | 2538842648 |
| 14 | 9356257550 |
| 15 | 34457742152 |
| 16 | 126613738962 |
| 17 | 464595415916 |
| 18 | 1703705288482 |
| 19 | 6242056357676 |
| 20 | 22851249560906 |
| 21 | 83609513888316 |