# A308338 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 9
4 44
5 270
6 2064
7 17682
8 171296
9 1867968
10 22470840
11 294493320
12 4195969392
13 64416698112
14 1059685905264
15 18609306423120
16 347179119075840
17 6855335163907200
18 142889687354283264
19 3133647091691585280
20 72124075333003155840
21 1738384773846440146560