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 | 1 |
| 6 | 3 |
| 7 | 7 |
| 8 | 15 |
| 9 | 31 |
| 10 | 64 |
| 11 | 130 |
| 12 | 262 |
| 13 | 526 |
| 14 | 1054 |
| 15 | 2111 |
| 16 | 4225 |
| 17 | 8453 |
| 18 | 16909 |
| 19 | 33821 |
| 20 | 67646 |
| 21 | 135296 |
| 22 | 270596 |
| 23 | 541196 |
| 24 | 1082396 |
| 25 | 2164797 |
| 26 | 4329599 |
| 27 | 8659203 |
| 28 | 17318411 |
| 29 | 34636827 |
| 30 | 69273660 |
| 31 | 138547326 |
| 32 | 277094658 |
| 33 | 554189322 |
| 34 | 1108378650 |
| 35 | 2216757307 |
| 36 | 4433514621 |
| 37 | 8867029249 |
| 38 | 17734058505 |
| 39 | 35468117017 |
| 40 | 70936234042 |