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A090347 as a simple table

na(n)
21
33
48
55
6-156
7-1253
848
9116937
101236140
11-4517689
12-317599800
13-3473788019
1443408737540
152033846838675
1619004486417504
17-643679274285679
18-24665731809676452
19-135665006897593601
2015018201730467027960

[1,3,8,5,-156,-1253,48,116937,1236140,-4517689,
 -317599800,-3473788019,43408737540,2033846838675,
 19004486417504,-643679274285679,
 -24665731809676452,-135665006897593601,
 15018201730467027960]