# A003006 (b-file synthesized from sequence entry)
1 1
2 1
3 2
4 3
5 7
6 15
7 35
8 81
9 195
10 473
11 1170
12 2920
13 7378
14 18787
15 48242
16 124658
17 324095
18 846872
19 2223352
20 5861011
21 15508423
22 41173560
23 109648734