# A386708 (b-file synthesized from sequence entry)
0 1
1 4
2 20
3 120
4 820
5 6128
6 48712
7 404480
8 3467380
9 30449680
10 272490096
11 2475669984
12 22773747400
13 211687194400
14 1985153038400
15 18758489742400
16 78433735606900
17 1707187621512400
18 16418042200744400
19 158619019424898400
20 1538786416105372400
21 14983597493316174400