# A047142 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 10
4 38
5 142
6 470
7 1576
8 5940
9 22714
10 83456
11 305088
12 1158606
13 4456076
14 16946498
15 64189932
16 246350606
17 952607962
18 3675557676
19 14158562010
20 54805236890
21 213011072542
22 828185178452
23 3219077811678
24 12537974366478