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 | 2 |
| 1 | 8 |
| 2 | 38 |
| 3 | 188 |
| 4 | 938 |
| 5 | 4688 |
| 6 | 23438 |
| 7 | 117188 |
| 8 | 585938 |
| 9 | 2929688 |
| 10 | 14648438 |
| 11 | 73242188 |
| 12 | 366210938 |
| 13 | 1831054688 |
| 14 | 9155273438 |
| 15 | 45776367188 |
| 16 | 228881835938 |
| 17 | 1144409179688 |
| 18 | 5722045898438 |
| 19 | 28610229492188 |
| 20 | 143051147460938 |
| 21 | 715255737304688 |