# A047108 (b-file synthesized from sequence entry)
0 1
1 4
2 15
3 57
4 215
5 812
6 3083
7 11750
8 44934
9 172401
10 663370
11 2559008
12 9894006
13 38331115
14 148770379
15 578346672
16 2251636041
17 8777816518
18 34261079538
19 133873978089
20 523638632149
21 2050085911219
22 8033148700174
23 31502487793694