# A020025 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 5
4 18
5 89
6 523
7 3599
8 28342
9 251532
10 2483877
11 27012163
12 320769441
13 4129906549
14 57302453361
15 852373993744
16 13531437150692
17 228343001917932
18 4081631159283027
19 77040788131467135
20 1531185664112909315