# A019256 (b-file synthesized from sequence entry)
3 1
4 1
5 0
6 0
7 0
8 8
9 32
10 94
11 214
12 406
13 880
14 2074
15 5306
16 14210
17 36964
18 92980
19 234406
20 597498
21 1534998
22 3971724
23 10292662
24 26631740
25 68951396
26 179026062
27 466232040
28 1217413238
29 3186168982
30 8354182670
31 21938929228