# A026899 (b-file synthesized from sequence entry)
1 1
2 6
3 30
4 144
5 687
6 3296
7 15972
8 78294
9 388320
10 1947910
11 9875566
12 50560246
13 261177401
14 1360112590
15 7134802722
16 37673830960
17 200106632766
18 1068539351340
19 5733226876876
20 30894846668416
21 167137498306038
22 907416216735816