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 | 317 |
| 3 | 3163 |
| 4 | 31469 |
| 5 | 314159 |
| 6 | 3141601 |
| 7 | 31415971 |
| 8 | 314159311 |
| 9 | 3141592661 |
| 10 | 31415926541 |
| 11 | 314159265359 |
| 12 | 3141592653601 |
| 13 | 31415926535933 |
| 14 | 314159265359057 |
| 15 | 3141592653589861 |
| 16 | 31415926535897999 |
| 17 | 314159265358979347 |
| 18 | 3141592653589793239 |
| 19 | 31415926535897932429 |
| 20 | 314159265358979323861 |