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 | 28 |
| 1 | 168 |
| 2 | 448 |
| 3 | 1008 |
| 4 | 2128 |
| 5 | 4368 |
| 6 | 8848 |
| 7 | 17808 |
| 8 | 35728 |
| 9 | 71568 |
| 10 | 143248 |
| 11 | 286608 |
| 12 | 573328 |
| 13 | 1146768 |
| 14 | 2293648 |
| 15 | 4587408 |
| 16 | 9174928 |
| 17 | 18349968 |
| 18 | 36700048 |
| 19 | 73400208 |
| 20 | 146800528 |
| 21 | 293601168 |
| 22 | 587202448 |
| 23 | 1174405008 |
| 24 | 2348810128 |
| 25 | 4697620368 |
| 26 | 9395240848 |
| 27 | 18790481808 |
| 28 | 37580963728 |
| 29 | 75161927568 |
| 30 | 150323855248 |