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A292521 as a simple table

na(n)
02
10
21
3-1
43
5-3
66
7-10
815
9-25
1041
11-65
12106
13-172
14277
15-449
16727
17-1175
181902
19-3078
204979
21-8057
2213037
23-21093
2434130
25-55224
2689353
27-144577
28233931
29-378507
30612438
31-990946
321603383
33-2594329
344197713
35-6792041
3610989754
37-17781796
3828771549
39-46553345

[2,0,1,-1,3,-3,6,-10,15,-25,41,-65,106,-172,277,
 -449,727,-1175,1902,-3078,4979,-8057,13037,-21093,
 34130,-55224,89353,-144577,233931,-378507,612438,
 -990946,1603383,-2594329,4197713,-6792041,
 10989754,-17781796,28771549,-46553345]