# A074433 (b-file synthesized from sequence entry)
1 0
2 0
3 1
4 12
5 60
6 270
7 1296
8 6048
9 29160
10 155520
11 883872
12 5038848
13 28304640
14 157697280
15 877515379
16 4899999744
17 27554100480
18 156116108160
19 889181991936
20 5078255822436
21 29045467518171
22 166348496793600
23 954240788994048
24 5484237660094464
25 31581437286776820