# A220266 (b-file synthesized from sequence entry)
0 1
1 4
2 18
3 144
4 1604
5 22944
6 400624
7 8259680
8 196358760
9 5287879092
10 159094582274
11 5288950560768
12 192527721428892
13 7616404083126180
14 325361411700398046
15 14926683772801407168
16 731947910056020737036
17 38204289826040411251632
18 2114787166947079113869760