# A321574 (b-file synthesized from sequence entry)
0 1
1 4
2 20
3 108
4 604
5 3444
6 19876
7 115644
8 676748
9 3977316
10 23451700
11 138634764
12 821221692
13 4872734676
14 28952250564
15 172222729308
16 1025461169772
17 6110912705220
18 36441840179284
19 217450403367852
20 1298228971572764
21 7754336590794804
22 46335720234364900