# A118677 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 18
4 60
5 202
6 718
7 2600
8 9748
9 37270
10 146058
11 582548
12 2367028
13 9761890
14 40844168
15 173001018
16 741193056
17 3207480526
18 14008373662
19 61683982696
20 273658651700
21 1222314257450
22 5493414465900
23 24828463984518