# A068091 (b-file synthesized from sequence entry)
1 1
2 3
3 11
4 44
5 186
6 814
7 3648
8 16611
9 76437
10 354112
11 1647344
12 7682237
13 35873310
14 167625690
15 783470179
16 3662035980
17 17115684065
18 79986841677
19 373759118882
20 1746296080947