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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 7 |
| 7 | 43 |
| 8 | 169 |
| 9 | 505 |
| 10 | 1261 |
| 11 | 5545 |
| 12 | 55441 |
| 13 | 442729 |
| 14 | 2540539 |
| 15 | 11381371 |
| 16 | 54534481 |
| 17 | 548974609 |
| 18 | 6572212921 |
| 19 | 59711454433 |
| 20 | 413207026561 |
| 21 | 2551872368305 |
| 22 | 24405087826351 |
| 23 | 356232375255835 |
| 24 | 4526838244526137 |
| 25 | 44179554690486601 |
| 26 | 358234717042702501 |