# A051844 (b-file synthesized from sequence entry)
0 2
1 6
2 30
3 90
4 1530
5 16830
6 218790
7 9407970
8 2417848290
9 137817352530
10 28252557268650
11 19296496614487950
12 4650455684091595950
13 12700394473254148539450
14 41619192688853844763777650
15 13775952780010622616810402150
16 902834617343556174437903325704550