# A049165 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 9
4 31
5 113
6 429
7 1681
8 6739
9 27523
10 114093
11 478843
12 2030689
13 8688595
14 37461651
15 162604083
16 709963053
17 3116099485
18 13740924463
19 60847717965
20 270470978627
21 1206406375485
22 5397984469009
23 24222544060981