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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 1 |
| 11 | 2 |
| 12 | 4 |
| 13 | 8 |
| 14 | 18 |
| 15 | 36 |
| 16 | 73 |
| 17 | 146 |
| 18 | 295 |
| 19 | 590 |
| 20 | 1182 |
| 21 | 2364 |
| 22 | 4732 |
| 23 | 9464 |
| 24 | 18929 |
| 25 | 37858 |
| 26 | 75721 |
| 27 | 151442 |
| 28 | 302878 |
| 29 | 605756 |
| 30 | 1211504 |
| 31 | 2423008 |
| 32 | 4845968 |
| 33 | 9691936 |
| 34 | 19383784 |
| 35 | 38767568 |
| 36 | 77534894 |
| 37 | 155069788 |
| 38 | 310139104 |
| 39 | 620278208 |
| 40 | 1240555349 |