# A128656 (b-file synthesized from sequence entry)
1 2
2 8
3 44
4 240
5 1248
6 6224
7 30052
8 141536
9 653744
10 2973072
11 13351192
12 59333408
13 261378944
14 1142885664
15 4965331028
16 21452209600
17 92230169232
18 394819386896
19 1683663903016
20 7155148746912
21 30313584232640
22 128067598573408