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 | 5 |
| 2 | 28 |
| 3 | 98 |
| 4 | 291 |
| 5 | 806 |
| 6 | 2164 |
| 7 | 5729 |
| 8 | 15072 |
| 9 | 39542 |
| 10 | 103615 |
| 11 | 271370 |
| 12 | 710568 |
| 13 | 1860413 |
| 14 | 4870756 |
| 15 | 12751946 |
| 16 | 33385179 |
| 17 | 87403694 |
| 18 | 228826012 |
| 19 | 599074457 |
| 20 | 1568397480 |
| 21 | 4106118110 |
| 22 | 10749956983 |
| 23 | 28143752978 |
| 24 | 73681302096 |
| 25 | 192900153461 |
| 26 | 505019158444 |
| 27 | 1322157322034 |