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A004402 as a simple table

na(n)
01
1-2
24
3-8
414
5-24
640
7-64
8100
9-154
10232
11-344
12504
13-728
141040
15-1472
162062
17-2864
183948
19-5400
207336
21-9904
2213288
23-17728
2423528
25-31066
2640824
27-53408
2869568
29-90248
30116624
31-150144
32192612
33-246256
34313808

[1,-2,4,-8,14,-24,40,-64,100,-154,232,-344,504,
 -728,1040,-1472,2062,-2864,3948,-5400,7336,-9904,
 13288,-17728,23528,-31066,40824,-53408,69568,
 -90248,116624,-150144,192612,-246256,313808]