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A178417 as a simple table

na(n)
11
21
31
44
5-3
619
7-67
840
9-1243
10-4299
11-25627
12-334324
13627929
14-29742841
15372632409
16-1946165680
17128948361769
181488182579081
1952394610324649
202333568937567764
21-5642424912729707
223857844273728205019

[1,1,1,4,-3,19,-67,40,-1243,-4299,-25627,-334324,
 627929,-29742841,372632409,-1946165680,
 128948361769,1488182579081,52394610324649,
 2333568937567764,-5642424912729707,
 3857844273728205019]