# A177117 (b-file synthesized from sequence entry)
0 1
1 4
2 4
3 18
4 60
5 270
6 1152
7 5254
8 24028
9 112606
10 533320
11 2559974
12 12404900
13 60657566
14 298826672
15 1482082774
16 7393735948
17 37078771678
18 186813107800
19 945165976262
20 4800095713844
21 24461416209374
22 125046320212160