# A373757 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 1
4 8
5 60
6 490
7 4480
8 45920
9 524440
10 6619200
11 91568400
12 1377884200
13 22401579200
14 391192401600
15 7300174281400
16 144938169376000
17 3049711320656000
18 67777255079934400
19 1586172656920051200
20 38984454900431040000
21 1003827897443395024000