# A067312 (b-file synthesized from sequence entry)
1 4
2 24
3 117
4 527
5 3116
6 11753
7 76443
8 354144
9 1721764
10 9653287
11 34867797
12 242017776
13 1064447283
14 5583548873
15 29729597084
16 116749235904
17 761741108157
18 3175197967656
19 17982575014036
20 91004468168113