# A179611 (b-file synthesized from sequence entry)
0 1
1 4
2 16
3 68
4 280
5 1168
6 4848
7 20160
8 83776
9 348224
10 1447296
11 6015488
12 25002240
13 103917568
14 431915008
15 1795179520
16 7461349376
17 31011794944
18 128895102976
19 535729963008
20 2226667929600
21 9254755975168
22 38465775239168