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 | 3 |
| 1 | 31 |
| 2 | 314 |
| 3 | 3142 |
| 4 | 31416 |
| 5 | 314159 |
| 6 | 3141593 |
| 7 | 31415927 |
| 8 | 314159265 |
| 9 | 3141592654 |
| 10 | 31415926536 |
| 11 | 314159265359 |
| 12 | 3141592653590 |
| 13 | 31415926535898 |
| 14 | 314159265358979 |
| 15 | 3141592653589793 |
| 16 | 31415926535897932 |
| 17 | 314159265358979324 |
| 18 | 3141592653589793238 |
| 19 | 31415926535897932385 |
| 20 | 314159265358979323846 |