# A147536 (b-file synthesized from sequence entry)
0 5
1 16
2 52
3 172
4 580
5 1996
6 7012
7 25132
8 91780
9 340876
10 1284772
11 4902892
12 18902980
13 73486156
14 287567332
15 1131137452
16 4467154180
17 17696429836
18 70269158692
19 279526952812
20 1113458765380