# A138272 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 28
4 268
5 3164
6 43672
7 682632
8 11834536
9 224283416
10 4597330748
11 101100605540
12 2370095338372
13 58924635472260
14 1546999678599872
15 42734731811302304
16 1238309697485975648
17 37538075865014728096