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 | 6 |
| 3 | 36 |
| 4 | 66 |
| 5 | 666 |
| 6 | 333336 |
| 7 | 936396 |
| 8 | 963966 |
| 9 | 3966336 |
| 10 | 3996939936 |
| 11 | 99363693366 |
| 12 | 63666996693966 |
| 13 | 339666999336666 |
| 14 | 633636693339936 |
| 15 | 39696699699366996 |
| 16 | 999699963339963966 |
| 17 | 36936333639936696636 |
| 18 | 6933666366666339963969663666 |
| 19 | 393996396333933393393669696696 |
| 20 | 399693363966633933999339639336 |