# A135884 (b-file synthesized from sequence entry)
0 1
1 4
2 26
3 216
4 2171
5 25628
6 348050
7 5352788
8 92056223
9 1752149568
10 36591725976
11 832352590164
12 20493399785598
13 543168774618834
14 15424012639825146
15 467276557333020682
16 15046702103550879196
17 513273141160665106150