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 | 22 |
| 2 | 44 |
| 3 | 88 |
| 4 | 1616 |
| 5 | 3232 |
| 6 | 6464 |
| 7 | 128128 |
| 8 | 256256 |
| 9 | 512512 |
| 10 | 10241024 |
| 11 | 20482048 |
| 12 | 40964096 |
| 13 | 81928192 |
| 14 | 1638416384 |
| 15 | 3276832768 |
| 16 | 6553665536 |
| 17 | 131072131072 |
| 18 | 262144262144 |
| 19 | 524288524288 |
| 20 | 10485761048576 |
| 21 | 20971522097152 |
| 22 | 41943044194304 |
| 23 | 83886088388608 |
| 24 | 1677721616777216 |