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 | 11 |
| 3 | 85 |
| 4 | 575 |
| 5 | 3661 |
| 6 | 22631 |
| 7 | 137845 |
| 8 | 833375 |
| 9 | 5019421 |
| 10 | 30174551 |
| 11 | 181222405 |
| 12 | 1087861775 |
| 13 | 6528756781 |
| 14 | 39177307271 |
| 15 | 235078159765 |
| 16 | 1410511939775 |
| 17 | 8463200647741 |
| 18 | 50779591044791 |
| 19 | 304678708005925 |