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A090399 as a simple table

na(n)
01
12
24
38
414
524
640
764
8100
9152
10224
11320
12440
13576
14704
15768
16656
17160
18-1088
19-3712
20-8736
21-17792
22-33408
23-59392
24-101312
25-167040
26-267264
27-415744
28-628864
29-923648
30-1312768
31-1794048
32-2330368
33-2813440
34-3001344
35-2414592
36-168448
375289984
3816582656

[1,2,4,8,14,24,40,64,100,152,224,320,440,576,704,
 768,656,160,-1088,-3712,-8736,-17792,-33408,
 -59392,-101312,-167040,-267264,-415744,-628864,
 -923648,-1312768,-1794048,-2330368,-2813440,
 -3001344,-2414592,-168448,5289984,16582656]