# A030953 (b-file synthesized from sequence entry)
1 2
2 4
3 13
4 52
5 261
6 1567
7 10970
8 87761
9 789855
10 7898554
11 86884101
12 1042609219
13 13553919858
14 189754878021
15 2846323170326
16 45541170725230
17 774199902328924
18 13935598241920639
19 264776366596492150
20 5295527331929843000