# A308878 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 14
4 86
5 664
6 6136
7 66240
8 816672
9 11331552
10 174662304
11 2961774144
12 54785368128
13 1097882522112
14 23693117756928
15 547844658441216
16 13511950038494208
17 354086653712228352
18 9824794572366544896
19 287752569360558907392
20 8871374335098501292032