# A356885 (b-file synthesized from sequence entry)
0 1
1 0
2 2
3 3
4 -4
5 30
6 954
7 6300
8 6432
9 424872
10 18273960
11 260682840
12 1754408424
13 47063118960
14 2314149100704
15 54798086299320
16 773632032345600
17 20746972036284480
18 1072205580591921600
19 36098491880448944640
20 816375193722964932480
21 25160238159364392336000