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 | 9 |
| 2 | 77 |
| 3 | 609 |
| 4 | 5221 |
| 5 | 44914 |
| 6 | 383279 |
| 7 | 3267224 |
| 8 | 27844845 |
| 9 | 237311925 |
| 10 | 2022585862 |
| 11 | 17238412156 |
| 12 | 146922412111 |
| 13 | 1252214688188 |
| 14 | 10672581690652 |
| 15 | 90962034893584 |
| 16 | 775266190295021 |
| 17 | 6607566186841867 |
| 18 | 56316051804768503 |
| 19 | 479979708366734131 |
| 20 | 4090849998653543166 |