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A229628 as a simple table

na(n)
11
22
3-12
4-8
5544
6-2656
7-16320
8141696
9724224
10-6796288
11-7730176
12319698944
13221900800
14-6301081600
15-44793036800
162700224856064
171941732786176
18-12433466195968
19-27512426201088
202231502495547392
21288268735217664
22-1425307636596736
23-18345681160765440

[1,2,-12,-8,544,-2656,-16320,141696,724224,
 -6796288,-7730176,319698944,221900800,-6301081600,
 -44793036800,2700224856064,1941732786176,
 -12433466195968,-27512426201088,2231502495547392,
 288268735217664,-1425307636596736,
 -18345681160765440]