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A156697 as a simple table

na(n)
01
11
21
31
4-2
51
61
716
816
91
101
11-224
121792
13-224
141
151
164480
17501760
18501760
194480
201
211
22-116480
23260915200
24-3652812800
25260915200
26-116480
271
281
293727360
30217081446400
3160782804992000
3260782804992000
33217081446400
343727360
351

[1,1,1,1,-2,1,1,16,16,1,1,-224,1792,-224,1,1,4480,
 501760,501760,4480,1,1,-116480,260915200,
 -3652812800,260915200,-116480,1,1,3727360,
 217081446400,60782804992000,60782804992000,
 217081446400,3727360,1]