# A007206 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 -2
4 -6
5 -18
6 -54
7 -168
8 -534
9 -1732
10 -5706
11 -19038
12 -64176
13 -218190
14 -747180
15 -2574488
16 -8918070
17 -31036560
18 -108457488
19 -380390574
20 -1338495492
21 -4723664566
22 -16714545822
23 -59286878556
24 -210755970528
25 -750721297056
26 -2679075662922
27 -9577156141654
28 -34290858526926
29 -122959225609518