Please,help me. Is it right?
0,
2,
12,
60,
320,
1950,
13692,
109592,
986400,
9864090,
108505100,
1302061332,
16926797472,
236975164790,
3554627472060,
56874039553200,
966858672404672,
17403456103284402,
330665665962403980,
6613313319248079980,
138879579704209680000