# A026661 (b-file synthesized from sequence entry)
1 1
2 5
3 20
4 87
5 358
6 1533
7 6445
8 27555
9 117529
10 503001
11 2167209
12 9289047
13 40320051
14 173069913
15 755481768
16 3247042719
17 14236984102
18 61259521341
19 269560841080
20 1161017915091
21 5123885956516
22 22087793150253
23 97719510829418