# A075211 (b-file synthesized from sequence entry)
1 1
2 1
3 3
4 7
5 21
6 75
7 256
8 929
9 3090
10 9235
11 21216
12 80463
13 138623
14 423595
15 1160355
16 2456117
17 4272856
18 15986299
19 21709209
20 75452662
21 156068738