# A003199 (b-file synthesized from sequence entry)
0 1
1 4
2 8
3 16
4 32
5 54
6 100
7 182
8 328
9 494
10 984
11 1572
12 2656
13 4212
14 8162
15 11176
16 21704
17 30994
18 60548