k | N | n | M |
2 | 6 | 1 | 5 |
3 | 84 | 20 | 64 |
4 | 1820 | 495 | 1325 |
5 | 53130 | 15504 | 37626 |
6 | 1947772 | 776475 | 1171297 |
7 | 85900584 | 26978328 | 58922256 |