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 | 5 |
| 2 | 41 |
| 3 | 653 |
| 4 | 4159 |
| 5 | 14159 |
| 6 | 358979 |
| 7 | 1592653 |
| 8 | 28841971 |
| 9 | 795028841 |
| 10 | 5926535897 |
| 11 | 93238462643 |
| 12 | 141592653589 |
| 13 | 9265358979323 |
| 14 | 23846264338327 |
| 15 | 841971693993751 |
| 16 | 8628034825342117 |
| 17 | 89793238462643383 |
| 18 | 348253421170679821 |
| 19 | 3832795028841971693 |
| 20 | 89793238462643383279 |