# A020033 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 1
4 3
5 12
6 62
7 393
8 2862
9 23714
10 220205
11 2264965
12 25561752
13 314044379
14 4172303889
15 59604341272
16 911094930877
17 14837831731420
18 256482519928831
19 4689966078698629
20 90449345803473559
21 1834829586299035049