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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 6 |
| 6 | 14 |
| 7 | 30 |
| 8 | 77 |
| 9 | 196 |
| 10 | 525 |
| 11 | 1414 |
| 12 | 3960 |
| 13 | 11056 |
| 14 | 31636 |
| 15 | 90818 |
| 16 | 264657 |
| 17 | 774146 |
| 18 | 2289787 |
| 19 | 6798562 |
| 20 | 20354005 |
| 21 | 61164374 |
| 22 | 184985060 |
| 23 | 561433922 |
| 24 | 1712696708 |
| 25 | 5241637812 |