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A367721 as a simple table

na(n)
01
11
21
3-5
4-23
51
6601
77771
826545
9-401183
10-6965999
11-42828389
12528611161
1315543020065
14141983039017
15-2393449681349
16-83586615493919
17-708151768946879
1815447932991283105
19635290179334026427
207146984268771158601
21-162583738763505944639

[1,1,1,-5,-23,1,601,7771,26545,-401183,-6965999,
 -42828389,528611161,15543020065,141983039017,
 -2393449681349,-83586615493919,-708151768946879,
 15447932991283105,635290179334026427,
 7146984268771158601,-162583738763505944639]