# A001071 (b-file synthesized from sequence entry)
1 2
2 1
3 4
4 10
5 36
6 108
7 392
8 1363
9 5000
10 18223
11 67792
12 252938
13 952540
14 3602478
15 13699554
16 52296713
17 200406388
18 770411478
19 2970401696
20 11482395526
21 44491881090
22 172766311857
23 672186650116