# A001396 (b-file synthesized from sequence entry)
0 1
1 4
2 28
3 188
4 1428
5 10708
6 82948
7 644788
8 5067404
9 40016460
10 317727164
11 2532064332
12 20247784124
13 162353831796
14 1304943724900
15 10510168583516