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) |
|---|---|
| 6 | 1 |
| 7 | 6 |
| 8 | 32 |
| 9 | 152 |
| 10 | 690 |
| 11 | 3028 |
| 12 | 12996 |
| 13 | 54812 |
| 14 | 228284 |
| 15 | 939148 |
| 16 | 3833076 |
| 17 | 15487428 |
| 18 | 62244564 |
| 19 | 247973928 |
| 20 | 984221764 |
| 21 | 3876113404 |
| 22 | 15223550024 |
| 23 | 59379645924 |
| 24 | 231124139318 |
| 25 | 894157177372 |
| 26 | 3453279084296 |
| 27 | 13266154255196 |
| 28 | 50886266714598 |
| 29 | 194294744477756 |
| 30 | 740816697816046 |