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 | 1 |
| 2 | 7 |
| 3 | 41 |
| 4 | 184 |
| 5 | 1069 |
| 6 | 5624 |
| 7 | 29907 |
| 8 | 161800 |
| 9 | 862953 |
| 10 | 4631107 |
| 11 | 24832532 |
| 12 | 133028028 |
| 13 | 713283085 |
| 14 | 3822965706 |
| 15 | 20491221900 |
| 16 | 109840081931 |
| 17 | 588746006676 |
| 18 | 3155783700063 |
| 19 | 16915482096570 |
| 20 | 90669231898345 |
| 21 | 486001022349368 |
| 22 | 2605035346917456 |
| 23 | 13963368769216664 |