# A006961 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 6
4 15
5 31
6 75
7 164
8 388
9 887
10 2092
11 4884
12 11599
13 27443
14 65509
15 156427
16 375263
17 901353
18 2171313
19 5237581
20 12658815
21 30633725
22 74238228
23 180106656
24 437437445
25 1063425655
26 2587564434
27 6301175326
28 15356071604
29 37448674536