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 | 69 |
| 3 | 535 |
| 4 | 4210 |
| 5 | 33158 |
| 6 | 261939 |
| 7 | 2063378 |
| 8 | 16277793 |
| 9 | 128351805 |
| 10 | 1012130530 |
| 11 | 7981569963 |
| 12 | 62939687472 |
| 13 | 496326792470 |
| 14 | 3913894569563 |
| 15 | 30863877179841 |
| 16 | 243384068190066 |
| 17 | 1919259204181410 |
| 18 | 15134747411461711 |
| 19 | 119348431276698530 |