# A077595 (b-file synthesized from sequence entry)
0 1
1 4
2 28
3 96
4 1328
5 4672
6 33472
7 121856
8 3597056
9 13417472
10 33655808
11 127508480
12 5829259264
13 22308732928
14 171393728512
15 660468137984
16 40831182635008
17 22589996269568
18 175323994652672
19 681560447647744
20 10614717931323392