# A075999 (b-file synthesized from sequence entry)
1 1
2 2
3 6
4 8
5 30
6 72
7 112
8 384
9 1080
10 1800
11 6336
12 13824
13 26208
14 94080
15 345600
16 368640
17 1057536
18 5598720
19 6566400
20 24192000
21 74511360
22 93671424
23 457850880
24 955514880
25 2156544000
26 5887365120
27 16460236800
28 40967700480
29 101025792000