# A378668 (b-file synthesized from sequence entry)
0 1
1 2
2 13
3 112
4 1104
5 11778
6 132374
7 1543740
8 18505996
9 226632616
10 2823110349
11 35659080952
12 455652487060
13 5879489288828
14 76502741016012
15 1002670573618324
16 13224761472453756
17 175404372357915096
18 2338003752387818372
19 31302169754776944512
20 420760252068869028028