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) |
|---|---|
| 1 | 1 |
| 2 | 131 |
| 3 | 2577 |
| 4 | 23723 |
| 5 | 141694 |
| 6 | 636426 |
| 7 | 2331462 |
| 8 | 7323954 |
| 9 | 20396871 |
| 10 | 51550213 |
| 11 | 120271151 |
| 12 | 262391493 |
| 13 | 540659756 |
| 14 | 1060489444 |
| 15 | 1992739932 |
| 16 | 3605846676 |
| 17 | 6310148349 |
| 18 | 10717864983 |
| 19 | 17722868317 |
| 20 | 28605158351 |
| 21 | 45165823626 |
| 22 | 69899222030 |
| 23 | 106210179010 |
| 24 | 158685165990 |