# A052649 (b-file synthesized from sequence entry)
0 2
1 5
2 14
3 54
4 264
5 1560
6 10800
7 85680
8 766080
9 7620480
10 83462400
11 997920000
12 12933043200
13 180583603200
14 2702527027200
15 43153254144000
16 732297646080000
17 13160434839552000
18 249692574523392000
19 4987449116762112000
20 104614786351595520000
21 2299092397726924800000