# A331615 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 14
4 85
5 640
6 5703
7 58760
8 685353
9 8925632
10 128231627
11 2014061568
12 34312150525
13 630043097216
14 12400033125647
15 260357810321664
16 5807790344591953
17 137144754146230272
18 3417248676737769619
19 89590823377278496768
20 2465026658283881339301