# A353165 (b-file synthesized from sequence entry)
0 1
1 0
2 2
3 3
4 24
5 125
6 900
7 7987
8 72240
9 817488
10 9536940
11 127816931
12 1830739680
13 28597812685
14 481145656992
15 8650951895040
16 166376275228800
17 3392537585542577
18 73342277086465296
19 1672523286398099407
20 40158685461798481560
21 1012415090497566344400