# A074445 (b-file synthesized from sequence entry)
1 0
2 0
3 2
4 12
5 60
6 300
7 1296
8 5616
9 28080
10 155520
11 883872
12 5018112
13 28304640
14 158130514
15 878719104
16 4899999744
17 27554100480
18 156139902720
19 889181991936
20 5077739844402
21 29043991855542
22 166348496793600
23 954240788994048
24 5484206701412352
25 31581437286776820