# A066768 (b-file synthesized from sequence entry)
1 1
2 3
3 7
4 23
5 71
6 261
7 925
8 3455
9 12877
10 48693
11 184757
12 705713
13 2704157
14 10401527
15 40116677
16 155120975
17 601080391
18 2333619351
19 9075135301
20 35345312513
21 137846529751
22 538258059199
23 2104098963721
24 8233431436745
25 32247603683171