# A091588 (b-file synthesized from sequence entry)
0 1
1 3
2 8
3 24
4 67
5 195
6 580
7 1730
8 5179
9 15533
10 46578
11 139712
12 419115
13 1257319
14 3771930
15 11315764
16 33947261
17 101841751
18 305525228
19 916575642
20 2749726883