# A037591 (b-file synthesized from sequence entry)
1 1
2 5
3 28
4 141
5 705
6 3528
7 17641
8 88205
9 441028
10 2205141
11 11025705
12 55128528
13 275642641
14 1378213205
15 6891066028
16 34455330141
17 172276650705
18 861383253528
19 4306916267641
20 21534581338205
21 107672906691028
22 538364533455141