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 | 1 |
| 8 | 6 |
| 9 | 26 |
| 10 | 94 |
| 11 | 308 |
| 12 | 941 |
| 13 | 2744 |
| 14 | 7722 |
| 15 | 21166 |
| 16 | 56809 |
| 17 | 149971 |
| 18 | 390517 |
| 19 | 1005491 |
| 20 | 2564164 |
| 21 | 6485901 |
| 22 | 16289602 |
| 23 | 40659669 |
| 24 | 100934017 |
| 25 | 249343899 |
| 26 | 613286048 |
| 27 | 1502515487 |
| 28 | 3667953650 |
| 29 | 8925161513 |
| 30 | 21652815724 |
| 31 | 52387028291 |