# A093843 (b-file synthesized from sequence entry)
1 2
2 4
3 8
4 66
5 264
6 3740
7 22440
8 294525
9 2094400
10 33929280
11 277603200
12 14504767200
13 174057206400
14 4363862817600
15 57021140816640
16 1603719585468000
17 48300260456448000
18 729870602452992000
19 24200972607651840000