# A030913 (b-file synthesized from sequence entry)
1 1
2 2
3 7
4 31
5 156
6 940
7 6580
8 52642
9 473778
10 4737780
11 52115580
12 625386966
13 8130030563
14 113820427882
15 1707306418237
16 27316902691801
17 464387345760618
18 8358972223691130
19 158820472250131476
20 3176409445002629538