# A047107 (b-file synthesized from sequence entry)
0 1
1 3
2 10
3 36
4 130
5 476
6 1769
7 6630
8 25017
9 94961
10 362181
11 1386826
12 5328341
13 20531796
14 79315343
15 307077270
16 1191203283
17 4628896233
18 18015359847
19 70212552034
20 273990076816
21 1070416998344
22 4186254302972
23 16387566482916