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 | 13 |
| 2 | 413 |
| 3 | 1413 |
| 4 | 51413 |
| 5 | 951413 |
| 6 | 2951413 |
| 7 | 62951413 |
| 8 | 562951413 |
| 9 | 3562951413 |
| 10 | 53562951413 |
| 11 | 853562951413 |
| 12 | 9853562951413 |
| 13 | 79853562951413 |
| 14 | 979853562951413 |
| 15 | 3979853562951413 |
| 16 | 23979853562951413 |
| 17 | 323979853562951413 |
| 18 | 8323979853562951413 |
| 19 | 48323979853562951413 |