# A175896 (b-file synthesized from sequence entry)
0 1
1 2
2 9
3 57
4 396
5 2948
6 23016
7 185838
8 1539066
9 13001677
10 111600446
11 970550862
12 8533427593
13 75728797781
14 677427655798
15 6102015206945
16 55299451023428
17 503847366381836
18 4612663920303329
19 42409513650507927
20 391425863599784588