# A232995 (b-file synthesized from sequence entry)
3 0
4 0
5 128
6 6912
7 301056
8 13107200
9 604661760
10 30105600000
11 1625414303744
12 95105071448064
13 6014219459788800
14 409597814515957760
15 29930757120000000000
16 2338124811342685667328
17 194579196865600687702016
18 17194638200501483392204800
19 1608612930338829120118456320
20 158879430213632000000000000000