# A036775 (b-file synthesized from sequence entry)
0 0
1 1
2 2
3 9
4 64
5 620
6 7620
7 113610
8 1992480
9 40194000
10 916927200
11 23341071600
12 655922836800
13 20169411662400
14 673645440468000
15 24285190867938000
16 939899116892736000
17 38870133445791648000
18 1710655202853140544000
19 79826043011286892320000
20 3936948118406837614080000
21 204621522793150838094720000