# A296665 (b-file synthesized from sequence entry)
0 1
1 4
2 20
3 96
4 444
5 2000
6 8840
7 38528
8 166124
9 710256
10 3016056
11 12736064
12 53530840
13 224107936
14 935062544
15 3890018816
16 16141765964
17 66829954736
18 276135664664
19 1138932645056
20 4690042582664
21 19285299964256
22 79196366286704
23 324835930747136
24 1330905207444344