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A303350 as a simple table

na(n)
01
12
20
310
4-10
538
6-76
7310
8-960
93190
10-10672
1137262
12-130170
13459690
14-1639940
155901498
16-21376154
1777900710
18-285457200
191051118590
20-3887169486
2114431323506
22-53766825940
23200964040290
24-753348868380
252831669141514
26-10670007388128

[1,2,0,10,-10,38,-76,310,-960,3190,-10672,37262,
 -130170,459690,-1639940,5901498,-21376154,
 77900710,-285457200,1051118590,-3887169486,
 14431323506,-53766825940,200964040290,
 -753348868380,2831669141514,-10670007388128]