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 | 1 |
| 1 | 6 |
| 2 | 48 |
| 3 | 384 |
| 4 | 3072 |
| 5 | 24576 |
| 6 | 196608 |
| 7 | 1572864 |
| 8 | 12582912 |
| 9 | 100663296 |
| 10 | 805306368 |
| 11 | 6442450944 |
| 12 | 51539607552 |
| 13 | 412316860416 |
| 14 | 3298534883328 |
| 15 | 26388279066624 |
| 16 | 211106232532992 |
| 17 | 1688849860263936 |
| 18 | 13510798882111488 |
| 19 | 108086391056891904 |
| 20 | 864691128455135232 |