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A325670 as a simple table

na(n)
12
20
31
4-3
57
6-15
731
8-63
9127
10-255
11510
12-1011
131968
14-3717
156720
16-11439
1717874
18-24309
1924309
200
21-92358
22352485
23-997569
242485242
25-5754024
2612680955
27-26924184
2855410642
29-110821283
30215426355
31-406270425
32740354804
33-1294617072
342145852303

[2,0,1,-3,7,-15,31,-63,127,-255,510,-1011,1968,
 -3717,6720,-11439,17874,-24309,24309,0,-92358,
 352485,-997569,2485242,-5754024,12680955,
 -26924184,55410642,-110821283,215426355,
 -406270425,740354804,-1294617072,2145852303]