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 | 15 |
| 7 | 35 |
| 8 | 630 |
| 9 | 126 |
| 10 | 6930 |
| 11 | 9570 |
| 12 | 202455 |
| 13 | 35035 |
| 14 | 3612609 |
| 15 | 361725 |
| 16 | 25350780 |
| 17 | 50620220 |
| 18 | 1262865060 |
| 19 | 15864468 |
| 20 | 33652405845 |
| 21 | 942571665 |
| 22 | 68217941715 |
| 23 | 72924794635 |
| 24 | 7281932609490 |
| 25 | 364040548850 |
| 26 | 111203641740750 |
| 27 | 79780936522950 |
| 28 | 2097251547484275 |
| 29 | 471615091340211 |