# A381300 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 9
4 60
5 485
6 4800
7 57547
8 804160
9 12783969
10 228447360
11 4539156941
12 99244045824
13 2367795157741
14 61230675251200
15 1706241143585175
16 50971847057326080
17 1625178125581055297
18 55087299146009640960
19 1978201530490562626609
20 75025096312729021972480