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 | 44 |
| 5 | 152 |
| 6 | 564 |
| 7 | 2200 |
| 8 | 8922 |
| 9 | 37460 |
| 10 | 162526 |
| 11 | 726772 |
| 12 | 3337360 |
| 13 | 15676000 |
| 14 | 75057142 |
| 15 | 365302740 |
| 16 | 1803191210 |
| 17 | 9011209620 |
| 18 | 45528658362 |
| 19 | 232340523516 |
| 20 | 1196799936312 |
| 21 | 6219980254704 |
| 22 | 32605664415000 |
| 23 | 172351828064208 |