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) |
|---|---|
| 4 | 1 |
| 5 | 8 |
| 6 | 44 |
| 7 | 184 |
| 8 | 662 |
| 9 | 2120 |
| 10 | 6256 |
| 11 | 17276 |
| 12 | 45277 |
| 13 | 113568 |
| 14 | 274592 |
| 15 | 643220 |
| 16 | 1465838 |
| 17 | 3260428 |
| 18 | 7097338 |
| 19 | 15153288 |
| 20 | 31791822 |
| 21 | 65645360 |
| 22 | 133584864 |
| 23 | 268213400 |
| 24 | 531879490 |
| 25 | 1042657088 |
| 26 | 2022113788 |
| 27 | 3882468712 |
| 28 | 7384455791 |
| 29 | 13921287616 |
| 30 | 26026092198 |
| 31 | 48273051172 |
| 32 | 88868177735 |