# A005304 (b-file synthesized from sequence entry)
1 2
2 2
3 4
4 10
5 18
6 32
7 58
8 98
9 164
10 274
11 442
12 704
13 1114
14 1730
15 2660
16 4058
17 6114
18 9136
19 13554
20 19930