# A047157 (b-file synthesized from sequence entry)
0 1
1 2
2 3
3 24
4 104
5 316
6 1347
7 5007
8 19908
9 78909
10 300750
11 1172598
12 4544071
13 17726423
14 69374599
15 270603617
16 1057755306
17 4135771322
18 16192627389
19 63483189171
20 248975461678
21 977164006398
22 3837265545654
23 15078469605272