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 | 4 |
| 2 | 9 |
| 3 | 19 |
| 4 | 37 |
| 5 | 75 |
| 6 | 149 |
| 7 | 299 |
| 8 | 597 |
| 9 | 1195 |
| 10 | 2389 |
| 11 | 4779 |
| 12 | 9557 |
| 13 | 19115 |
| 14 | 38229 |
| 15 | 76459 |
| 16 | 152917 |
| 17 | 305835 |
| 18 | 611669 |
| 19 | 1223339 |
| 20 | 2446677 |
| 21 | 4893355 |
| 22 | 9786709 |
| 23 | 19573419 |
| 24 | 39146837 |
| 25 | 78293675 |
| 26 | 156587349 |
| 27 | 313174699 |
| 28 | 626349397 |
| 29 | 1252698795 |
| 30 | 2505397589 |
| 31 | 5010795179 |
| 32 | 10021590357 |
| 33 | 20043180715 |