# A333881 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 1
4 2
5 6
6 16
7 37
8 114
9 478
10 1907
11 6777
12 28414
13 148579
14 758916
15 3580189
16 18981485
17 117883917
18 720627553
19 4193077474
20 26795418840
21 191751387094
22 1352954503595
23 9301704998742
24 69285817230370
25 559142785301527
26 4453089770243547
27 35182348161102172