# A376568 (b-file synthesized from sequence entry)
0 1
1 6
2 51
3 450
4 4095
5 37908
6 354978
7 3351348
8 31833945
9 303822090
10 2910657321
11 27970777926
12 269484894081
13 2602002636540
14 25170322256010
15 243876058527132
16 2366251795228437
17 22987502934573762
18 223563791480714685
19 2176402892261301990
20 21206170582394740371