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) |
|---|---|
| 24 | 1 |
| 25 | 25 |
| 26 | 325 |
| 27 | 2925 |
| 28 | 20475 |
| 29 | 118755 |
| 30 | 593775 |
| 31 | 2629575 |
| 32 | 10518300 |
| 33 | 38567100 |
| 34 | 131128140 |
| 35 | 417225900 |
| 36 | 1251677700 |
| 37 | 3562467300 |
| 38 | 9669554100 |
| 39 | 25140840660 |
| 40 | 62852101650 |
| 41 | 151584480450 |
| 42 | 353697121050 |
| 43 | 800472431850 |
| 44 | 1761039350070 |
| 45 | 3773655750150 |
| 46 | 7890371113950 |
| 47 | 16123801841550 |