# A083880 (b-file synthesized from sequence entry)
0 1
1 5
2 27
3 155
4 929
5 5725
6 35883
7 227155
8 1446241
9 9237845
10 59114907
11 378678635
12 2427143489
13 15561826285
14 99793962603
15 640017621475
16 4104915074881
17 26328745454885
18 168874407826587
19 1083182932803515
20 6947717948023649