# A179496 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 21
4 164
5 1590
6 18984
7 266154
8 4306672
9 78850080
10 1612769040
11 36436534200
12 901265930784
13 24223557739056
14 702975780428544
15 21907246213656720
16 729670520457987840
17 25867686811627795200
18 972505009580975483904