# A152268 (b-file synthesized from sequence entry)
0 0
1 1
2 7
3 41
4 231
5 1289
6 7175
7 39913
8 221991
9 1234633
10 6866503
11 38188457
12 212387175
13 1181202569
14 6569320583
15 36535623529
16 203194800039
17 1130078612041
18 6284991883975
19 34954314291497
20 194400264968679
21 1081167340448777