# A374982 (b-file synthesized from sequence entry)
0 1
1 4
2 16
3 80
4 480
5 3840
6 42240
7 675840
8 16220160
9 600145920
10 34808463360
11 3202378629120
12 470749658480640
13 111096919401431040
14 42216829372543795200
15 25878916405369346457600
16 25620127241315652993024000
17 40992203586105044788838400000