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A006496 as a simple table

na(n)
00
12
24
3-2
4-24
5-38
644
7278
8336
9-718
10-3116
11-2642
1210296
1333802
1416124
15-136762
16-354144
17-24478
181721764
193565918
20-1476984
21-20783558
22-34182196
2335553398
24242017776
25306268562
26-597551756
27-2726446322
28-2465133864
298701963882
3029729597084
3115949374758

[0,2,4,-2,-24,-38,44,278,336,-718,-3116,-2642,
 10296,33802,16124,-136762,-354144,-24478,1721764,
 3565918,-1476984,-20783558,-34182196,35553398,
 242017776,306268562,-597551756,-2726446322,
 -2465133864,8701963882,29729597084,15949374758]