# A107284 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 20
4 74
5 284
6 1116
7 4424
8 17622
9 70340
10 281076
11 1123736
12 4493828
13 17973080
14 71887896
15 287542736
16 1150153322
17 4600578044
18 18402241836
19 73608826664
20 294435025580
21 1177739540168
22 4710957036936
23 18843825900272
24 75375299107260