gap> G:=SpaceGroup(4,1100);;
gap> R:=ResolutionCubicalCrystGroup(G,20);
Resolution of length 20 in characteristic 0 for &lt;matrix group with 
8 generators&gt; . 

gap> Size(R);
[ 40, 215, 522, 738, 962, 1198, 1466, 1734, 2034, 2334, 2666, 2998, 3362, 
  3726, 4122, 4518, 4946, 5374, 5834, 6294 ]
