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) |
|---|---|
| 2 | 1 |
| 3 | 6 |
| 4 | 25 |
| 5 | 98 |
| 6 | 399 |
| 7 | 1746 |
| 8 | 8271 |
| 9 | 42284 |
| 10 | 231939 |
| 11 | 1357128 |
| 12 | 8427181 |
| 13 | 55288860 |
| 14 | 381798629 |
| 15 | 2765917074 |
| 16 | 20960284277 |
| 17 | 165729739590 |
| 18 | 1364153612299 |
| 19 | 11665484410094 |
| 20 | 103448316470723 |
| 21 | 949739632313480 |
| 22 | 9013431476894623 |
| 23 | 88304011710168668 |
| 24 | 891917738589610553 |