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 | 11 |
| 1 | 121 |
| 2 | 1341 |
| 3 | 14871 |
| 4 | 164921 |
| 5 | 1829001 |
| 6 | 20283931 |
| 7 | 224952241 |
| 8 | 2494758581 |
| 9 | 27667296631 |
| 10 | 306835021521 |
| 11 | 3402852533361 |
| 12 | 37738212888491 |
| 13 | 418523194306761 |
| 14 | 4641493350262861 |
| 15 | 51474950047198231 |
| 16 | 570865943869443401 |
| 17 | 6331000332611075641 |
| 18 | 70211869602591275451 |