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) |
|---|---|
| 5 | 1 |
| 6 | 9 |
| 7 | 56 |
| 8 | 300 |
| 9 | 1485 |
| 10 | 7007 |
| 11 | 32032 |
| 12 | 143208 |
| 13 | 629850 |
| 14 | 2735810 |
| 15 | 11767536 |
| 16 | 50220040 |
| 17 | 212952285 |
| 18 | 898198875 |
| 19 | 3771484800 |
| 20 | 15775723920 |
| 21 | 65770848990 |
| 22 | 273420862110 |
| 23 | 1133802618000 |
| 24 | 4691140763400 |
| 25 | 19371432850770 |
| 26 | 79850555673174 |