# A006904 (b-file synthesized from sequence entry)
4 1
5 1
6 4
7 5
8 14
9 23
10 52
11 97
12 202
13 395
14 800
15 1589
16 3190
17 6367
18 12748
19 25481
20 50978
21 101939
22 203896
23 407773
24 815566
25 1631111
26 3262244
27 6524465
28 13048954
29 26097883
30 52195792
31 104391557