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 | 5 |
| 3 | 10 |
| 4 | 21 |
| 5 | 43 |
| 6 | 87 |
| 7 | 175 |
| 8 | 352 |
| 9 | 707 |
| 10 | 1417 |
| 11 | 2836 |
| 12 | 5674 |
| 13 | 11353 |
| 14 | 22716 |
| 15 | 45443 |
| 16 | 90886 |
| 17 | 181748 |
| 18 | 363451 |
| 19 | 726870 |
| 20 | 1453773 |
| 21 | 2907648 |
| 22 | 5815315 |
| 23 | 11630195 |
| 24 | 23259059 |
| 25 | 46515887 |
| 26 | 93029852 |
| 27 | 186060921 |
| 28 | 372129424 |
| 29 | 744272221 |
| 30 | 1488552317 |
| 31 | 2977079872 |