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) |
|---|---|
| 4 | 1 |
| 5 | 19 |
| 6 | 191 |
| 7 | 1400 |
| 8 | 8373 |
| 9 | 43277 |
| 10 | 199982 |
| 11 | 844734 |
| 12 | 3312600 |
| 13 | 12197369 |
| 14 | 42536231 |
| 15 | 141442928 |
| 16 | 450904486 |
| 17 | 1384174772 |
| 18 | 4106738807 |
| 19 | 11812667512 |
| 20 | 33028600519 |
| 21 | 89972796303 |
| 22 | 239259681221 |
| 23 | 622181676256 |
| 24 | 1584594241651 |
| 25 | 3957870842872 |