# A006570 (b-file synthesized from sequence entry)
1 1
2 2
3 5
4 15
5 48
6 166
7 596
8 2221
9 8472
10 32995
11 130507
12 523100
13 2119454
14 8667529
15 35727261
16 148285069
17 619172847
18 2599212499
19 10963049307
20 46437309218
21 197454056586
22 842504023722
23 3606195947971
24 15480329150558
25 66628688247862
26 287475949517326
27 1243140817965661