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A290971 as a simple table

na(n)
11
22
30
46
50
6-6
70
854
90
10-30
110
12-114
130
14-126
150
164470
170
18-294
190
20-5850
210
22-2046
230
24-92418
250
26-8190
270
28-247674
290
302010
310
3230229110
330
34-131070
350
36-8200914
370
38-524286
390
40-362617770
410
42183162
430
44-354416634
450
46-8388606
470
48-53614489794
490

[1,2,0,6,0,-6,0,54,0,-30,0,-114,0,-126,0,4470,0,
 -294,0,-5850,0,-2046,0,-92418,0,-8190,0,-247674,0,
 2010,0,30229110,0,-131070,0,-8200914,0,-524286,0,
 -362617770,0,183162,0,-354416634,0,-8388606,0,
 -53614489794,0]