# A354305 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 9
4 192
5 1800
6 103680
7 529200
8 232243200
9 8230118400
10 1463132160000
11 39833773056000
12 20858412072960000
13 1615657835151360000
14 584619573580922880000
15 1908495817772544000000
16 29184209113159670169600000
17 3953548328298349068288000000
18 185476873609942457647104000000