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 | 3 |
| 2 | 14 |
| 3 | 68 |
| 4 | 347 |
| 5 | 1819 |
| 6 | 9712 |
| 7 | 52532 |
| 8 | 286905 |
| 9 | 1578679 |
| 10 | 8738278 |
| 11 | 48601968 |
| 12 | 271406347 |
| 13 | 1520725095 |
| 14 | 8545396208 |
| 15 | 48138689272 |
| 16 | 271768537793 |
| 17 | 1537212749339 |
| 18 | 8709732836238 |
| 19 | 49423440297324 |
| 20 | 280835252080651 |
| 21 | 1597731101233763 |