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 | 157 |
| 3 | 3141 |
| 4 | 6283 |
| 5 | 314159 |
| 6 | 392699 |
| 7 | 15707963 |
| 8 | 62831853 |
| 9 | 3141592653 |
| 10 | 6283185307 |
| 11 | 157079632679 |
| 12 | 3141592653589 |
| 13 | 31415926535897 |
| 14 | 314159265358979 |
| 15 | 3141592653589793 |
| 16 | 7853981633974483 |
| 17 | 314159265358979323 |
| 18 | 1570796326794896619 |
| 19 | 981747704246810387 |