# A077920 (b-file synthesized from sequence entry)
0 1
1 -1
2 4
3 -7
4 18
5 -38
6 88
7 -195
8 441
9 -988
10 2223
11 -4992
12 11220
13 -25208
14 56645
15 -127277
16 285992
17 -642615
18 1443946
19 -3244514
20 7290360
21 -16381287
22 36808421
23 -82707768
24 185842671
25 -417584688
26 938304280
27 -2108350576
28 4737420745
29 -10644887785
30 23918845740
31 -53745158519
32 120764274994