# A066052 (b-file synthesized from sequence entry)
1 0
2 0
3 2
4 14
5 94
6 644
7 4808
8 39556
9 360260
10 3619304
11 39881104
12 478861448
13 6226452296
14 87175900720
15 1307664018464
16 20922743681264
17 355687216296688
18 6402372708414176
19 121645095599130560
20 2432901984417975904
21 51090942051756747104
22 1124000727158723041088
23 25852016735627132757376