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A081478 as a simple table

na(n)
11
22
32
4-2
56
6-6
742
8-42
91806
10-1806
113263442
12-3263442
1310650056950806
14-10650056950806
15113423713055421844361000442
16-113423713055421844361000442
1712864938683278671740537145998360961546653259485195806

[1,2,2,-2,6,-6,42,-42,1806,-1806,3263442,-3263442,
 10650056950806,-10650056950806,
 113423713055421844361000442,
 -113423713055421844361000442,
 12864938683278671740537145998360961546653259485195\
 806]