# A047008 (b-file synthesized from sequence entry)
0 1
1 4
2 14
3 50
4 180
5 658
6 2429
7 9052
8 33975
9 128320
10 487124
11 1857362
12 7108400
13 27293280
14 105090130
15 405643176
16 1569193041
17 6082113750
18 23615073305
19 91834287660
20 357631419474
21 1394521107804
22 5444070076494
23 21275915138100