Hi, try this,
(20,6,3,4)=37
1,2,5,8,15,17
1,2,6,9,14,19
1,2,10,11,13,19
1,3,4,6,10,13
1,3,9,16,17,18
1,4,5,7,8,13
1,4,9,11,19,20
1,6,12,14,18,20
1,7,8,10,11,14
1,12,13,14,15,16
2,3,4,8,14,19
2,3,5,6,11,20
2,3,7,10,12,19
2,4,11,14,17,18
2,4,12,13,16,18
2,6,7,8,9,18
2,6,7,16,17,20
2,9,10,13,15,20
3,4,7,15,16,19
3,5,6,12,13,19
3,5,10,14,16,17
3,7,11,15,18,20
3,8,9,11,12,15
3,8,13,14,17,20
4,5,9,10,11,18
4,5,10,12,17,20
4,6,7,9,14,15
4,6,8,15,17,18
5,6,8,9,11,16
5,7,9,10,12,17
5,7,11,12,13,14
5,8,10,15,18,19
5,14,16,18,19,20
6,11,12,15,17,19
7,9,13,17,18,19
8,10,12,16,19,20
10,11,13,15,16,18