# A006660 (b-file synthesized from sequence entry)
3 1
4 1
5 2
6 3
7 7
8 14
9 36
10 81
11 221
12 538
13 1530
14 3926
15 11510
16 30694
17 92114
18 252939
19 773259
20 2172830
21 6743122
22 19304190
23 60658606
24 176343390
25 559952824
26 1649008456
27 5283239596
28 15730575554
29 50789908772
30 152663683494