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 | 13 |
| 1 | 26 |
| 2 | 52 |
| 3 | 104 |
| 4 | 208 |
| 5 | 416 |
| 6 | 832 |
| 7 | 1664 |
| 8 | 3328 |
| 9 | 6656 |
| 10 | 13312 |
| 11 | 26624 |
| 12 | 53248 |
| 13 | 106496 |
| 14 | 212992 |
| 15 | 425984 |
| 16 | 851968 |
| 17 | 1703936 |
| 18 | 3407872 |
| 19 | 6815744 |
| 20 | 13631488 |
| 21 | 27262976 |
| 22 | 54525952 |
| 23 | 109051904 |
| 24 | 218103808 |
| 25 | 436207616 |
| 26 | 872415232 |
| 27 | 1744830464 |
| 28 | 3489660928 |
| 29 | 6979321856 |
| 30 | 13958643712 |