# A047059 (b-file synthesized from sequence entry)
0 1
1 2
2 9
3 48
4 275
5 1652
6 10150
7 63282
8 398746
9 2533674
10 16205319
11 104195452
12 672838453
13 4360534510
14 28346553454
15 184759124740
16 1206997624839
17 7900952176826
18 51811230435895
19 340294870303512
20 2238219252373710