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A066405 as a simple table

na(n)
01
1-46
2769
3-5632
418688
5-44032
685760
7-147968
8234752
9-350208
10498432
11-683520
12909568
13-1180672
141500928
15-1874432
162305280
17-2797568
183355392
19-3982848
204684032
21-5463040
226323968
23-7270912
248307968
25-9439232
2610668800
27-12000768
2813439232
29-14988288

[1,-46,769,-5632,18688,-44032,85760,-147968,
 234752,-350208,498432,-683520,909568,-1180672,
 1500928,-1874432,2305280,-2797568,3355392,
 -3982848,4684032,-5463040,6323968,-7270912,
 8307968,-9439232,10668800,-12000768,13439232,
 -14988288]