# A011952 (b-file synthesized from sequence entry)
4 2
5 3
6 8
7 16
8 40
9 73
10 165
11 320
12 666
13 1323
14 2709
15 5364
16 10880
17 21675
18 43577
19 87040
20 174590
21 348787
22 698709
23 1396736
24 2795400
25 5589672