# A255139 (b-file synthesized from sequence entry)
0 1
1 0
2 1
3 4
4 21
5 115
6 712
7 5027
8 40299
9 362846
10 3628745
11 39916711
12 479001456
13 6227020567
14 87178290823
15 1307674367390
16 20922789887013
17 355687428094403
18 6402373705725416
19 121645100408827819
20 2432902008176633235
21 51090942171709429054