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 | 2 |
| 2 | 8 |
| 3 | 16 |
| 4 | 80 |
| 5 | 160 |
| 6 | 640 |
| 7 | 1280 |
| 8 | 6560 |
| 9 | 13120 |
| 10 | 52480 |
| 11 | 104960 |
| 12 | 524800 |
| 13 | 1049600 |
| 14 | 4198400 |
| 15 | 8396800 |
| 16 | 43046720 |
| 17 | 86093440 |
| 18 | 344373760 |
| 19 | 688747520 |
| 20 | 3443737600 |
| 21 | 6887475200 |
| 22 | 27549900800 |
| 23 | 55099801600 |
| 24 | 282386483200 |
| 25 | 564772966400 |