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 | 3 |
| 2 | 7 |
| 3 | 16 |
| 4 | 35 |
| 5 | 74 |
| 6 | 153 |
| 7 | 312 |
| 8 | 631 |
| 9 | 1270 |
| 10 | 2549 |
| 11 | 5108 |
| 12 | 10227 |
| 13 | 20466 |
| 14 | 40945 |
| 15 | 81904 |
| 16 | 163823 |
| 17 | 327662 |
| 18 | 655341 |
| 19 | 1310700 |
| 20 | 2621419 |
| 21 | 5242858 |
| 22 | 10485737 |
| 23 | 20971496 |
| 24 | 41943015 |
| 25 | 83886054 |
| 26 | 167772133 |
| 27 | 335544292 |
| 28 | 671088611 |
| 29 | 1342177250 |
| 30 | 2684354529 |
| 31 | 5368709088 |
| 32 | 10737418207 |
| 33 | 21474836446 |