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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | 3 |
| 5 | 9 |
| 6 | 19 |
| 7 | 41 |
| 8 | 85 |
| 9 | 181 |
| 10 | 375 |
| 11 | 769 |
| 12 | 1584 |
| 13 | 3224 |
| 14 | 6580 |
| 15 | 13354 |
| 16 | 27059 |
| 17 | 54521 |
| 18 | 110682 |
| 19 | 223509 |
| 20 | 450702 |
| 21 | 908240 |
| 22 | 1828936 |
| 23 | 3680596 |
| 24 | 7402790 |
| 25 | 14883096 |
| 26 | 29908688 |
| 27 | 60081574 |
| 28 | 120655821 |
| 29 | 242228178 |
| 30 | 486173375 |
| 31 | 975559168 |
| 32 | 1957148063 |
| 33 | 3925643991 |