# A016228 (b-file synthesized from sequence entry)
0 1
1 12
2 103
3 774
4 5425
5 36456
6 238267
7 1527258
8 9651829
9 60352380
10 374321311
11 2306963022
12 14146953913
13 86407602384
14 526075008835
15 3194597025666
16 19358317017277
17 117103576420068
18 707389830102439
19 4268180838524790
20 25728294320699521
21 154965812371951032