# A225050 (b-file synthesized from sequence entry)
0 1
1 4
2 24
3 148
4 920
5 5754
6 36204
7 229128
8 1458072
9 9325030
10 59905274
11 386368008
12 2500651244
13 16234450288
14 105680341560
15 689579733648
16 4509096746904
17 29539804567230
18 193843622021910
19 1273932593379600
20 8383551165082170
21 55238332546851630
22 364364231864557080