# A007021 (b-file synthesized from sequence entry)
3 1
4 1
5 1
6 1
7 1
8 2
9 4
10 10
11 25
12 87
13 313
14 1357
15 6244
16 30926
17 158428
18 836749
19 4504607
20 24649284
21 136610879
22 765598927
23 4332047595
24 24724362117
25 142205424580
26 823687567019
27 4801749063379