# A153938 (b-file synthesized from sequence entry)
0 1
1 2
2 2
3 3
4 15
5 24
6 95
7 901
8 2926
9 22625
10 415047
11 2632895
12 39794767
13 1442122393
14 17977314936
15 535815289761
16 38169625321927
17 935805308861487
18 54839755115620718
19 7680772354691458379
20 370282826884218784372