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 | 12 |
| 8 | 84 |
| 9 | 442 |
| 10 | 1932 |
| 11 | 7392 |
| 12 | 25551 |
| 13 | 81468 |
| 14 | 243126 |
| 15 | 686400 |
| 16 | 1848156 |
| 17 | 4775874 |
| 18 | 11904215 |
| 19 | 28737732 |
| 20 | 67416756 |
| 21 | 154122912 |
| 22 | 344177823 |
| 23 | 752310720 |
| 24 | 1612395007 |
| 25 | 3393652848 |
| 26 | 7023685794 |
| 27 | 14311193104 |
| 28 | 28737793986 |
| 29 | 56924936052 |
| 30 | 111323290934 |
| 31 | 215095157964 |
| 32 | 410895944148 |
| 33 | 776529566516 |