# A064340 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 28
4 256
5 2704
6 31168
7 380608
8 4840960
9 63458560
10 851399680
11 11635096576
12 161396604928
13 2266669453312
14 32166082822144
15 460531091685376
16 6644185553305600
17 96498260064403456
18 1409750653282287616