# A074424 (b-file synthesized from sequence entry)
1 0
2 1
3 2
4 6
5 36
6 240
7 1296
8 6312
9 31824
10 165840
11 883872
12 4861056
13 27433728
14 155696585
15 878719104
16 4938274944
17 27770211072
18 156752183808
19 889181991936
20 5067822213734
21 28987320651922
22 166186204664832
23 954240788994048
24 5486884531697664
25 31596861676172076