# A009672 (b-file synthesized from sequence entry)
0 0
1 1
2 2
3 4
4 24
5 172
6 1192
7 10176
8 106176
9 1212048
10 15123872
11 210069440
12 3195595392
13 52434870464
14 926003117184
15 17548224583168
16 354716499392512
17 7614573123195136
18 173087393243492864
19 4153672167748662272