# A005749 (b-file synthesized from sequence entry)
1 4
2 16
3 152
4 2368
5 47688
6 1156000
7 32699080
8 1057082752
9 38444581640
10 1553526946144
11 69054999618888
12 3348574955346496
13 175908582307762312
14 9951733002164182048
15 603217074746723736776
16 39001136297834245139200
17 2679228986900726147063304