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 | 10 |
| 2 | 21 |
| 3 | 26519722651971 |
| 4 | 33388573338856 |
| 5 | 69954026995401 |
| 6 | 80863378086336 |