# A255432 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 4
4 12
5 36
6 160
7 680
8 4368
9 24976
10 219616
11 1599104
12 18145600
13 160805568
14 2245960704
15 23437238656
16 389201754368
17 4669754525952
18 89893314615808
19 1218303508421632
20 26673872401980416
21 402798557886395392
22 9883555312758398976