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A368587 as a simple table

na(n)
00
11
24
39
420
526
696
7-210
82472
9-20961
10211612
11-2324729
1227901116
13-362708320
145077925048
15-76168864092
161218701840976
17-20717931276243
18372922762998708
19-7085532496941803
20141710649938878564
21-2975923648716396714
2265470320271760793488

[0,1,4,9,20,26,96,-210,2472,-20961,211612,
 -2324729,27901116,-362708320,5077925048,
 -76168864092,1218701840976,-20717931276243,
 372922762998708,-7085532496941803,
 141710649938878564,-2975923648716396714,
 65470320271760793488]