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 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 42 |
| 5 | 132 |
| 6 | 430 |
| 7 | 1444 |
| 8 | 4981 |
| 9 | 17594 |
| 10 | 63442 |
| 11 | 232828 |
| 12 | 867146 |
| 13 | 3269060 |
| 14 | 12446684 |
| 15 | 47771496 |
| 16 | 184544427 |
| 17 | 716658870 |
| 18 | 2794956099 |
| 19 | 10938266562 |
| 20 | 42930256917 |
| 21 | 168890693650 |
| 22 | 665739119129 |
| 23 | 2628578437646 |
| 24 | 10393091551794 |
| 25 | 41141896235012 |
| 26 | 163028816478833 |