# A074442 (b-file synthesized from sequence entry)
1 0
2 2
3 6
4 12
5 36
6 180
7 1008
8 5616
9 31824
10 176256
11 940896
12 5018112
13 27433728
14 153264960
15 865095552
16 4899999744
17 27770211072
18 157364529408
19 892662156288
20 5077739844402
21 28987320651922
22 166023914360832
23 953309368018944
24 5484206701412352
25 31596861676172076