# A171803 (b-file synthesized from sequence entry)
0 1
1 2
2 9
3 48
4 286
5 1818
6 12086
7 82992
8 584079
9 4190738
10 30539814
11 225426240
12 1681904909
13 12663614266
14 96099303213
15 734250983952
16 5643749482600
17 43610375803722
18 338578974873523
19 2639771240159904
20 20659895819582337