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A243863 as a simple table

na(n)
01
11
2-1
3-4
47
533
6-68
7-344
8767
94035
10-9425
11-50832
12122436
13671804
14-1653776
15-9189488
1622992655
17129001239
18-326863667
19-1847900500
204729547023
2126903463697
22-69424933968
23-396930961632
241031309398852
255921685690388
26-15474833826028
27-89179284390112
28234201961398776
291353916407418200

[1,1,-1,-4,7,33,-68,-344,767,4035,-9425,-50832,
 122436,671804,-1653776,-9189488,22992655,
 129001239,-326863667,-1847900500,4729547023,
 26903463697,-69424933968,-396930961632,
 1031309398852,5921685690388,-15474833826028,
 -89179284390112,234201961398776,1353916407418200]