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A009811 as a simple table

na(n)
00
12
2-4
3-42
4-456
510154
61263668
774121726
81582556016
9-396499390126
10-87145255604884
11-10528569148387290
12-379538283994219608
13201132350259244110074
1452827499211277672807332

[0,2,-4,-42,-456,10154,1263668,74121726,
 1582556016,-396499390126,-87145255604884,
 -10528569148387290,-379538283994219608,
 201132350259244110074,52827499211277672807332]