# A025256 (b-file synthesized from sequence entry)
1 1
2 1
3 3
4 3
5 6
6 18
7 42
8 105
9 291
10 792
11 2181
12 6177
13 17628
14 50679
15 147255
16 430917
17 1268292
18 3754926
19 11172828
20 33389040
21 100181994
22 301682709
23 911436117
24 2761852011
25 8392005462
26 25563691341
27 78053071611
28 238830914937
29 732247187460
30 2249217635238