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 | 7 |
| 3 | 19 |
| 4 | 44 |
| 5 | 95 |
| 6 | 195 |
| 7 | 395 |
| 8 | 794 |
| 9 | 1583 |
| 10 | 3172 |
| 11 | 6334 |
| 12 | 12665 |
| 13 | 25313 |
| 14 | 50596 |
| 15 | 101180 |
| 16 | 202326 |
| 17 | 404635 |
| 18 | 809227 |
| 19 | 1618410 |
| 20 | 3236766 |
| 21 | 6473474 |
| 22 | 12946903 |
| 23 | 25893723 |
| 24 | 51787365 |
| 25 | 103574668 |
| 26 | 207149213 |
| 27 | 414298342 |
| 28 | 828596584 |
| 29 | 1657193052 |
| 30 | 3314385970 |