# A019263 (b-file synthesized from sequence entry)
3 2
4 0
5 0
6 2
7 8
8 16
9 28
10 48
11 108
12 280
13 768
14 2086
15 5212
16 12532
17 30096
18 72366
19 176580
20 440612
21 1110820
22 2807834
23 7130100
24 18179108
25 46394348
26 118468710
27 302982828
28 776358572
29 1993785892
30 5133560494
31 13249748168
32 34266401908