# A005826 (b-file synthesized from sequence entry)
0 1
1 5
2 31
3 141
4 659
5 3005
6 13739
7 62669
8 285931
9 1304285
10 5949691
11 27139821
12 123799979
13 564720125
14 2576001179
15 11750565389
16 53600825611
17 244502996765
18 1115313334651
19 5087560678701
20 23207176728299
21 105860762282045
22 482889457961819
23 2202725765240909