# A176097 (b-file synthesized from sequence entry)
0 1
1 4
2 36
3 272
4 2150
5 16992
6 134848
7 1072192
8 8536914
9 68036600
10 542607560
11 4329671040
12 34561892560
13 275979195520
14 2204266118400
15 17609217372416
16 140698273234634
17 1124340854572296
18 8985828520591912
19 71822662173752800