# A149064 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 11
4 40
5 161
6 668
7 2836
8 12375
9 54900
10 247280
11 1125020
12 5172670
13 23971303
14 111796965
15 524564578
16 2473888979
17 11717814258
18 55713194024
19 265828035935
20 1272204602838
21 6104857054877
22 29367359951719
23 141586007793508
24 683967387118882
25 3310060952570425
26 16045866486100742
27 77901869473238047