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 | 9 |
| 3 | 23 |
| 4 | 51 |
| 5 | 107 |
| 6 | 219 |
| 7 | 443 |
| 8 | 891 |
| 9 | 1787 |
| 10 | 3579 |
| 11 | 7163 |
| 12 | 14331 |
| 13 | 28667 |
| 14 | 57339 |
| 15 | 114683 |
| 16 | 229371 |
| 17 | 458747 |
| 18 | 917499 |
| 19 | 1835003 |
| 20 | 3670011 |
| 21 | 7340027 |
| 22 | 14680059 |
| 23 | 29360123 |
| 24 | 58720251 |
| 25 | 117440507 |
| 26 | 234881019 |
| 27 | 469762043 |
| 28 | 939524091 |
| 29 | 1879048187 |
| 30 | 3758096379 |
| 31 | 7516192763 |
| 32 | 15032385531 |