# A174727 (b-file synthesized from sequence entry)
0 2
1 6
2 8
3 180
4 288
5 10080
6 17280
7 453600
8 806400
9 47900160
10 87091200
11 217945728000
12 402361344000
13 2241727488000
14 4184557977600
15 2000741783040000
16 3766102179840000
17 2838385676206080000
18 5377993912811520000
19 1686001091666411520000
20 3211430650793164800000
21 423033001181754163200000