# A159972 (b-file synthesized from sequence entry)
0 1
1 -1
2 0
3 2
4 -7
5 21
6 -63
7 195
8 -624
9 2054
10 -6916
11 23712
12 -82498
13 290510
14 -1033410
15 3707850
16 -13402695
17 48760365
18 -178405155
19 656043855
20 -2423307045
21 8987427465
22 -33453694485
23 124936258125
24 -467995871775
25 1757900019099
26 -6619846420551