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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 37 |
| 6 | 168 |
| 7 | 895 |
| 8 | 5097 |
| 9 | 30983 |
| 10 | 196096 |
| 11 | 1283552 |
| 12 | 8621364 |
| 13 | 59176966 |
| 14 | 413613891 |
| 15 | 2936303012 |
| 16 | 21128390679 |
| 17 | 153841228779 |
| 18 | 1131941424480 |
| 19 | 8406680733066 |
| 20 | 62958726953945 |
| 21 | 475074493277317 |
| 22 | 3609405128045162 |
| 23 | 27593870865196624 |
| 24 | 212159118489924538 |
| 25 | 1639760091688265416 |