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A325735 as a simple table

na(n)
1-3
20
30
41
5-4
610
7-20
836
9-64
10120
11-239
12484
13-946
141716
15-2794
163872
17-3872
181
1914160
20-52478
21143716
22-345400
23767976
24-1613128
253226257
26-6148960
2711119030
28-18874260
2929414650
30-39955040
3139955040
321
33-151615948
34575723786
35-1611404740
363936821260

[-3,0,0,1,-4,10,-20,36,-64,120,-239,484,-946,1716,
 -2794,3872,-3872,1,14160,-52478,143716,-345400,
 767976,-1613128,3226257,-6148960,11119030,
 -18874260,29414650,-39955040,39955040,1,
 -151615948,575723786,-1611404740,3936821260]