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 | 7 |
| 2 | 63 |
| 3 | 709 |
| 4 | 9709 |
| 5 | 157971 |
| 6 | 2993467 |
| 7 | 64976353 |
| 8 | 1593358809 |
| 9 | 43632348319 |
| 10 | 1321213523191 |
| 11 | 43869502390077 |
| 12 | 1585770335098693 |
| 13 | 62013234471100459 |
| 14 | 2609265444024424179 |
| 15 | 117558236422872707161 |
| 16 | 5647316731308685308337 |
| 17 | 288166881285968665526583 |
| 18 | 15566545814457889774570159 |
| 19 | 887503412305357492886020789 |