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A112117 as a simple table

na(n)
11
21
3-6
460
5-720
69398
7-126958
81719439
9-22778647
10288721672
11-3426131120
1237291873546
13-368633930696
143421668183648
15-33763691015949
16382711017377914
17-3403489111329505
18-22613095886515578
191672401759052466166
20-27936127591842262118
21-15637150116164531317

[1,1,-6,60,-720,9398,-126958,1719439,-22778647,
 288721672,-3426131120,37291873546,-368633930696,
 3421668183648,-33763691015949,382711017377914,
 -3403489111329505,-22613095886515578,
 1672401759052466166,-27936127591842262118,
 -15637150116164531317]