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) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 13 |
| 6 | 26 |
| 7 | 54 |
| 8 | 110 |
| 9 | 225 |
| 10 | 456 |
| 11 | 922 |
| 12 | 1862 |
| 13 | 3755 |
| 14 | 7562 |
| 15 | 15214 |
| 16 | 30584 |
| 17 | 61441 |
| 18 | 123362 |
| 19 | 247581 |
| 20 | 496694 |
| 21 | 996148 |
| 22 | 1997288 |
| 23 | 4003654 |
| 24 | 8023886 |
| 25 | 16078166 |
| 26 | 32212255 |
| 27 | 64527754 |
| 28 | 129246702 |
| 29 | 258848476 |
| 30 | 518358122 |
| 31 | 1037950430 |
| 32 | 2078209982 |
| 33 | 4160749569 |
| 34 | 8329633544 |