# A057009 (b-file synthesized from sequence entry)
1 1
2 7
3 41
4 235
5 1361
6 7987
7 47321
8 281995
9 1685921
10 10096867
11 60524201
12 362972155
13 2177309681
14 13062280147
15 78368930681
16 470199300715
17 2821152888641
18 16926788453827
19 101560343826761
20 609360901747675
21 3656161925798801
22 21936961098633907
23 131621735219132441