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 | 3 |
| 2 | 31 |
| 3 | 131 |
| 4 | 1319 |
| 5 | 913103 |
| 6 | 3013193 |
| 7 | 39131033 |
| 8 | 3301319309 |
| 9 | 903913103341 |
| 10 | 14330131930927 |
| 11 | 729039131033419 |
| 12 | 9143301319309279 |
| 13 | 97290391310334191 |
| 14 | 1914330131930927929 |
| 15 | 929729039131033419149 |
| 16 | 94191433013193092792927 |