# A077056 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 22
4 140
5 992
6 7584
7 61420
8 520320
9 4570292
10 41354416
11 383609434
12 3634231140
13 35059333218
14 343580813492
15 3413862553800
16 34336784362232
17 349131316634164
18 3584622273967324
19 37128374058146138
20 387630493693010928