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 | 2 |
| 5 | 22 |
| 6 | 82 |
| 7 | 268 |
| 8 | 742 |
| 9 | 1902 |
| 10 | 4562 |
| 11 | 10452 |
| 12 | 23068 |
| 13 | 49432 |
| 14 | 103364 |
| 15 | 211764 |
| 16 | 426354 |
| 17 | 845626 |
| 18 | 1655454 |
| 19 | 3203876 |
| 20 | 6137946 |
| 21 | 11652946 |
| 22 | 21944034 |
| 23 | 41021256 |
| 24 | 76174360 |
| 25 | 140595760 |
| 26 | 258061160 |
| 27 | 471255240 |
| 28 | 856536610 |
| 29 | 1550048766 |
| 30 | 2793774026 |
| 31 | 5016560956 |
| 32 | 8976350894 |