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 | 2 |
| 2 | 24 |
| 3 | 246 |
| 4 | 2468 |
| 5 | 24690 |
| 6 | 246912 |
| 7 | 2469134 |
| 8 | 24691356 |
| 9 | 246913578 |
| 10 | 2469135800 |
| 11 | 24691358022 |
| 12 | 246913580244 |
| 13 | 2469135802466 |
| 14 | 24691358024688 |
| 15 | 246913580246910 |
| 16 | 2469135802469132 |
| 17 | 24691358024691354 |
| 18 | 246913580246913576 |
| 19 | 2469135802469135798 |
| 20 | 24691358024691358020 |
| 21 | 246913580246913580242 |