# A132820 (b-file synthesized from sequence entry)
1 1
2 4
3 16
4 65
5 266
6 1092
7 4488
8 18447
9 75790
10 311168
11 1276496
12 5231954
13 21425236
14 87662200
15 358374960
16 1463921595
17 5975446230
18 24373220520
19 99348849600
20 404703270510
21 1647594225420
22 6703757163480