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 | 19 |
| 2 | 419 |
| 3 | 5419 |
| 4 | 35419 |
| 5 | 735419 |
| 6 | 9735419 |
| 7 | 159735419 |
| 8 | 14159735419 |
| 9 | 114159735419 |
| 10 | 60114159735419 |
| 11 | 2660114159735419 |
| 12 | 282660114159735419 |
| 13 | 6282660114159735419 |
| 14 | 206282660114159735419 |
| 15 | 13206282660114159735419 |