# A331538 (b-file synthesized from sequence entry)
0 0
1 1
2 3
3 16
4 147
5 1756
6 25910
7 453594
8 9184091
9 211075288
10 5427652794
11 154380255250
12 4812088559014
13 163110595450466
14 5973198636395003
15 235010723141883563
16 9886231689434154971
17 442799642855527526848
18 21038043034795035118742
19 1056802542597653892224802
20 55962024535834950971809754