# A025188 (b-file synthesized from sequence entry)
1 2
2 10
3 60
4 343
5 1968
6 11319
7 65351
8 378690
9 2201772
10 12839896
11 75076505
12 440016174
13 2584289200
14 15206283135
15 89625150180
16 529040216175
17 3127061645796
18 18506252646420
19 109644576096980
20 650280444390382