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 | 2 |
| 3 | 4 |
| 4 | 6 |
| 5 | 40 |
| 6 | 43 |
| 7 | 705 |
| 8 | 789 |
| 9 | 1148 |
| 10 | 2140 |
| 11 | 4276 |
| 12 | 5512 |
| 13 | 6672 |
| 14 | 8754 |
| 15 | 38434 |
| 16 | 174501 |
| 17 | 493578 |
| 18 | 598249 |
| 19 | 628064 |
| 20 | 702774 |
| 21 | 1368196 |
| 22 | 4584004 |
| 23 | 13813057 |
| 24 | 36425906 |
| 25 | 87964443 |
| 26 | 447997476 |
| 27 | 1964288296 |